Vorgehensweise: Behandeln von Benutzereingabeereignissen in Windows Forms-Steuerelementen
In diesem Beispiel wird veranschaulicht, wie die meisten Tastatur-, Maus-, Fokus- und Validierungsereignisse behandelt werden, die in einem Windows Forms-Steuerelement auftreten können. Das Textfeld TextBoxInput empfängt die Ereignisse, wenn es den Fokus besitzt; Informationen zu den einzelnen Ereignissen werden in der Reihenfolge, in der die Ereignisse ausgelöst werden, in das Textfeld TextBoxOutput geschrieben. Die Anwendung verfügt zudem über eine Reihe von Kontrollkästchen, mit denen gefiltert werden kann, welche Ereignisse gemeldet werden.
Beispiel
#using <System.Drawing.dll>
#using <System.Windows.Forms.dll>
#using <System.dll>
using namespace System;
using namespace System::Drawing;
using namespace System::ComponentModel;
using namespace System::Windows::Forms;
namespace UserInputWalkthrough
{
public ref class Form1 : public Form
{
Label^ lblEvent;
Label^ lblInput;
TextBox^ TextBoxOutput;
TextBox^ TextBoxInput;
GroupBox^ GroupBoxEvents;
Button^ ButtonClear;
LinkLabel^ LinkLabelDrag;
CheckBox^ CheckBoxToggleAll;
CheckBox^ CheckBoxMouse;
CheckBox^ CheckBoxMouseEnter;
CheckBox^ CheckBoxMouseMove;
CheckBox^ CheckBoxMousePoints;
CheckBox^ CheckBoxMouseDrag;
CheckBox^ CheckBoxMouseDragOver;
CheckBox^ CheckBoxKeyboard;
CheckBox^ CheckBoxKeyUpDown;
CheckBox^ CheckBoxFocus;
CheckBox^ CheckBoxValidation;
public:
Form1() : Form()
{
this->Load += gcnew EventHandler(this, &Form1::Form1_Load);
lblEvent = gcnew Label();
lblInput = gcnew Label();
TextBoxOutput = gcnew TextBox();
TextBoxInput = gcnew TextBox();
GroupBoxEvents = gcnew GroupBox();
ButtonClear = gcnew Button();
LinkLabelDrag = gcnew LinkLabel();
CheckBoxToggleAll = gcnew CheckBox();
CheckBoxMouse = gcnew CheckBox();
CheckBoxMouseEnter = gcnew CheckBox();
CheckBoxMouseMove = gcnew CheckBox();
CheckBoxMousePoints = gcnew CheckBox();
CheckBoxMouseDrag = gcnew CheckBox();
CheckBoxMouseDragOver = gcnew CheckBox();
CheckBoxKeyboard = gcnew CheckBox();
CheckBoxKeyUpDown = gcnew CheckBox();
CheckBoxFocus = gcnew CheckBox();
CheckBoxValidation = gcnew CheckBox();
}
private:
void Form1_Load(Object^ sender, EventArgs^ e)
{
this->GroupBoxEvents->SuspendLayout();
this->SuspendLayout();
lblEvent->Location = Point(232, 12);
lblEvent->Size = System::Drawing::Size(98, 14);
lblEvent->AutoSize = true;
lblEvent->Text = "Generated Events:";
lblInput->Location = Point(13, 12);
lblInput->Size = System::Drawing::Size(95, 14);
lblInput->AutoSize = true;
lblInput->Text = "User Input Target:";
TextBoxInput->Location = Point(13, 34);
TextBoxInput->Size = System::Drawing::Size(200, 200);
TextBoxInput->AllowDrop = true;
TextBoxInput->AutoSize = false;
TextBoxInput->Cursor = Cursors::Cross;
TextBoxInput->Multiline = true;
TextBoxInput->TabIndex = 1;
LinkLabelDrag->AllowDrop = true;
LinkLabelDrag->AutoSize = true;
LinkLabelDrag->Location = Point(13, 240);
LinkLabelDrag->Size = System::Drawing::Size(175, 14);
LinkLabelDrag->TabIndex = 2;
LinkLabelDrag->TabStop = true;
LinkLabelDrag->Text = "Click here to use as a drag source";
LinkLabelDrag->Links->Add(gcnew LinkLabel::Link(0,
LinkLabelDrag->Text->Length));
GroupBoxEvents->Location = Point(13, 281);
GroupBoxEvents->Size = System::Drawing::Size(200, 302);
GroupBoxEvents->Text = "Event Filter:";
GroupBoxEvents->TabStop = true;
GroupBoxEvents->TabIndex = 3;
GroupBoxEvents->Controls->Add(CheckBoxMouseEnter);
GroupBoxEvents->Controls->Add(CheckBoxToggleAll);
GroupBoxEvents->Controls->Add(CheckBoxMousePoints);
GroupBoxEvents->Controls->Add(CheckBoxKeyUpDown);
GroupBoxEvents->Controls->Add(CheckBoxMouseDragOver);
GroupBoxEvents->Controls->Add(CheckBoxMouseDrag);
GroupBoxEvents->Controls->Add(CheckBoxValidation);
GroupBoxEvents->Controls->Add(CheckBoxMouseMove);
GroupBoxEvents->Controls->Add(CheckBoxFocus);
GroupBoxEvents->Controls->Add(CheckBoxKeyboard);
GroupBoxEvents->Controls->Add(CheckBoxMouse);
CheckBoxToggleAll->AutoSize = true;
CheckBoxToggleAll->Location = Point(7, 20);
CheckBoxToggleAll->Size = System::Drawing::Size(122, 17);
CheckBoxToggleAll->TabIndex = 4;
CheckBoxToggleAll->Text = "Toggle All Events";
CheckBoxMouse->AutoSize = true;
CheckBoxMouse->Location = Point(7, 45);
CheckBoxMouse->Size = System::Drawing::Size(137, 17);
CheckBoxMouse->TabIndex = 5;
CheckBoxMouse->Text = "Mouse and Click Events";
CheckBoxMouseEnter->AutoSize = true;
CheckBoxMouseEnter->Location = Point(26, 69);
CheckBoxMouseEnter->Margin =
System::Windows::Forms::Padding(3, 3, 3, 1);
CheckBoxMouseEnter->Size = System::Drawing::Size(151, 17);
CheckBoxMouseEnter->TabIndex = 6;
CheckBoxMouseEnter->Text = "Mouse Enter/Hover/Leave";
CheckBoxMouseMove->AutoSize = true;
CheckBoxMouseMove->Location = Point(26, 89);
CheckBoxMouseMove->Margin =
System::Windows::Forms::Padding(3, 2, 3, 3);
CheckBoxMouseMove->Size = System::Drawing::Size(120, 17);
CheckBoxMouseMove->TabIndex = 7;
CheckBoxMouseMove->Text = "Mouse Move Events";
CheckBoxMousePoints->AutoSize = true;
CheckBoxMousePoints->Location = Point(26, 112);
CheckBoxMousePoints->Margin =
System::Windows::Forms::Padding(3, 3, 3, 1);
CheckBoxMousePoints->Size = System::Drawing::Size(141, 17);
CheckBoxMousePoints->TabIndex = 8;
CheckBoxMousePoints->Text = "Draw Mouse Points";
CheckBoxMouseDrag->AutoSize = true;
CheckBoxMouseDrag->Location = Point(26, 135);
CheckBoxMouseDrag->Margin =
System::Windows::Forms::Padding(3, 1, 3, 3);
CheckBoxMouseDrag->Size = System::Drawing::Size(151, 17);
CheckBoxMouseDrag->TabIndex = 9;
CheckBoxMouseDrag->Text = "Mouse Drag && Drop Events";
CheckBoxMouseDragOver->AutoSize = true;
CheckBoxMouseDragOver->Location = Point(44, 159);
CheckBoxMouseDragOver->Size = System::Drawing::Size(142, 17);
CheckBoxMouseDragOver->TabIndex = 10;
CheckBoxMouseDragOver->Text = "Mouse Drag Over Events";
CheckBoxKeyboard->AutoSize = true;
CheckBoxKeyboard->Location = Point(8, 184);
CheckBoxKeyboard->Size = System::Drawing::Size(103, 17);
CheckBoxKeyboard->TabIndex = 11;
CheckBoxKeyboard->Text = "Keyboard Events";
CheckBoxKeyUpDown->AutoSize = true;
CheckBoxKeyUpDown->Location = Point(26, 207);
CheckBoxKeyUpDown->Margin =
System::Windows::Forms::Padding(3, 3, 3, 1);
CheckBoxKeyUpDown->Size = System::Drawing::Size(133, 17);
CheckBoxKeyUpDown->TabIndex = 12;
CheckBoxKeyUpDown->Text = "Key Up && Down Events";
CheckBoxFocus->AutoSize = true;
CheckBoxFocus->Location = Point(8, 233);
CheckBoxFocus->Margin =
System::Windows::Forms::Padding(3, 2, 3, 3);
CheckBoxFocus->Size = System::Drawing::Size(146, 17);
CheckBoxFocus->TabIndex = 13;
CheckBoxFocus->Text = "Focus && Activation Events";
CheckBoxValidation->AutoSize = true;
CheckBoxValidation->Location = Point(8, 257);
CheckBoxValidation->Size = System::Drawing::Size(104, 17);
CheckBoxValidation->TabIndex = 14;
CheckBoxValidation->Text = "Validation Events";
TextBoxOutput->Location = Point(232, 34);
TextBoxOutput->Size = System::Drawing::Size(308, 510);
TextBoxOutput->Multiline = true;
TextBoxOutput->CausesValidation = false;
TextBoxOutput->ReadOnly = true;
TextBoxOutput->ScrollBars = ScrollBars::Vertical;
TextBoxOutput->TabIndex = 15;
TextBoxOutput->WordWrap = false;
ButtonClear->Location = Point(232, 560);
ButtonClear->Size = System::Drawing::Size(308, 23);
ButtonClear->TabIndex = 16;
ButtonClear->Text = "Clear Event List";
this->ClientSize = System::Drawing::Size(552, 595);
this->Controls->Add(LinkLabelDrag);
this->Controls->Add(ButtonClear);
this->Controls->Add(GroupBoxEvents);
this->Controls->Add(lblEvent);
this->Controls->Add(lblInput);
this->Controls->Add(TextBoxInput);
this->Controls->Add(TextBoxOutput);
this->Text = "User Input Events";
ButtonClear->Click +=
gcnew EventHandler(this, &Form1::ButtonClear_Click);
TextBoxInput->KeyDown +=
gcnew KeyEventHandler(this, &Form1::TextBoxInput_KeyDown);
TextBoxInput->KeyPress +=
gcnew KeyPressEventHandler(this,
&Form1::TextBoxInput_KeyPress);
TextBoxInput->KeyUp +=
gcnew KeyEventHandler(this, &Form1::TextBoxInput_KeyUp);
TextBoxInput->Click +=
gcnew EventHandler(this, &Form1::TextBoxInput_Click);
TextBoxInput->DoubleClick +=
gcnew EventHandler(this, &Form1::TextBoxInput_DoubleClick);
TextBoxInput->MouseClick +=
gcnew MouseEventHandler(this, &Form1::TextBoxInput_MouseClick);
TextBoxInput->MouseDoubleClick +=
gcnew MouseEventHandler(this,
&Form1::TextBoxInput_MouseDoubleClick);
TextBoxInput->MouseDown +=
gcnew MouseEventHandler(this, &Form1::TextBoxInput_MouseDown);
TextBoxInput->MouseUp +=
gcnew MouseEventHandler(this, &Form1::TextBoxInput_MouseUp);
TextBoxInput->MouseEnter +=
gcnew EventHandler(this, &Form1::TextBoxInput_MouseEnter);
TextBoxInput->MouseHover +=
gcnew EventHandler(this, &Form1::TextBoxInput_MouseHover);
TextBoxInput->MouseLeave +=
gcnew EventHandler(this, &Form1::TextBoxInput_MouseLeave);
TextBoxInput->MouseWheel +=
gcnew MouseEventHandler(this, &Form1::TextBoxInput_MouseWheel);
TextBoxInput->MouseMove +=
gcnew MouseEventHandler(this, &Form1::TextBoxInput_MouseMove);
TextBoxInput->MouseCaptureChanged +=
gcnew EventHandler(this,
&Form1::TextBoxInput_MouseCaptureChanged);
TextBoxInput->DragEnter +=
gcnew DragEventHandler(this, &Form1::TextBoxInput_DragEnter);
TextBoxInput->DragDrop +=
gcnew DragEventHandler(this, &Form1::TextBoxInput_DragDrop);
TextBoxInput->DragOver +=
gcnew DragEventHandler(this, &Form1::TextBoxInput_DragOver);
TextBoxInput->DragLeave +=
gcnew EventHandler(this, &Form1::TextBoxInput_DragLeave);
TextBoxInput->Enter +=
gcnew EventHandler(this, &Form1::TextBoxInput_Enter);
TextBoxInput->Leave +=
gcnew EventHandler(this, &Form1::TextBoxInput_Leave);
TextBoxInput->GotFocus +=
gcnew EventHandler(this, &Form1::TextBoxInput_GotFocus);
TextBoxInput->LostFocus +=
gcnew EventHandler(this, &Form1::TextBoxInput_LostFocus);
TextBoxInput->Validated +=
gcnew EventHandler(this, &Form1::TextBoxInput_Validated);
TextBoxInput->Validating +=
gcnew CancelEventHandler(this,
&Form1::TextBoxInput_Validating);
LinkLabelDrag->MouseDown +=
gcnew MouseEventHandler(this, &Form1::LinkLabelDrag_MouseDown);
LinkLabelDrag->GiveFeedback +=
gcnew GiveFeedbackEventHandler(this,
&Form1::LinkLabelDrag_GiveFeedback);
CheckBoxToggleAll->CheckedChanged +=
gcnew EventHandler(this,
&Form1::CheckBoxToggleAll_CheckedChanged);
CheckBoxMouse->CheckedChanged +=
gcnew EventHandler(this, &Form1::CheckBoxMouse_CheckedChanged);
CheckBoxMouseDrag->CheckedChanged +=
gcnew EventHandler(this,
&Form1::CheckBoxMouseDrag_CheckedChanged);
CheckBoxMouseEnter->CheckedChanged +=
gcnew EventHandler(this,
&Form1::CheckBoxMouseMove_CheckedChanged);
CheckBoxMouseMove->CheckedChanged +=
gcnew EventHandler(this,
&Form1::CheckBoxMouseMove_CheckedChanged);
CheckBoxKeyboard->CheckedChanged +=
gcnew EventHandler(this,
&Form1::CheckBoxKeyboard_CheckedChanged);
this->GroupBoxEvents->ResumeLayout(false);
this->GroupBoxEvents->PerformLayout();
this->ResumeLayout(false);
this->PerformLayout();
CheckAllChildCheckBoxes(this, true);
}
// Recursively search the form for all contained checkboxes and
// initially check them
private:
void CheckAllChildCheckBoxes(Control^ parent, bool value)
{
CheckBox^ box;
for each (Control^ currentControl in parent->Controls)
{
if (dynamic_cast<CheckBox^>(currentControl))
{
box = (CheckBox^)currentControl;
box->Checked = value;
}
// Recurse if control contains other controls
if (currentControl->Controls->Count > 0)
{
CheckAllChildCheckBoxes(currentControl, value);
}
}
}
// All-purpose method for displaying a line of text in one of the
// text boxes.
private:
void DisplayLine(String^ line)
{
TextBoxOutput->AppendText(line);
TextBoxOutput->AppendText(Environment::NewLine);
}
// Click event handler for the button that clears the text box.
private:
void ButtonClear_Click(Object^ sender, EventArgs^ e)
{
TextBoxOutput->Invalidate();
TextBoxOutput->Clear();
}
private:
void TextBoxInput_KeyDown(Object^ sender, KeyEventArgs^ e)
{
if (CheckBoxKeyUpDown->Checked)
{
DisplayLine("KeyDown: " + e->KeyData.ToString());
}
}
private:
void TextBoxInput_KeyUp(Object^ sender, KeyEventArgs^ e)
{
if (CheckBoxKeyUpDown->Checked)
{
DisplayLine("KeyUp: " + e->KeyData.ToString());
}
}
private:
void TextBoxInput_KeyPress(Object^ sender,
KeyPressEventArgs^ e)
{
if (CheckBoxKeyboard->Checked)
{
if (Char::IsWhiteSpace(e->KeyChar))
{
DisplayLine("KeyPress: WS");
}
else
{
DisplayLine("KeyPress: " + e->KeyChar.ToString());
}
}
}
private:
void TextBoxInput_Click(Object^ sender, EventArgs^ e)
{
if (CheckBoxMouse->Checked)
{
DisplayLine("Click event");
}
}
private:
void TextBoxInput_DoubleClick(Object^ sender, EventArgs^ e)
{
if (CheckBoxMouse->Checked)
{
DisplayLine("DoubleClick event");
}
}
private:
void TextBoxInput_MouseClick(Object^ sender, MouseEventArgs^ e)
{
if (CheckBoxMouse->Checked)
{
DisplayLine("MouseClick: " + e->Button.ToString() +
" " + e->Location.ToString());
}
}
private:
void TextBoxInput_MouseDoubleClick(Object^ sender,
MouseEventArgs^ e)
{
if (CheckBoxMouse->Checked)
{
DisplayLine("MouseDoubleClick: " + e->Button.ToString() +
" " + e->Location.ToString());
}
}
private:
void TextBoxInput_MouseDown(Object^ sender,
MouseEventArgs^ e)
{
if (CheckBoxMouse->Checked)
{
DisplayLine("MouseDown: " + e->Button.ToString() +
" " + e->Location.ToString());
}
}
private:
void TextBoxInput_MouseUp(Object^ sender,
MouseEventArgs^ e)
{
if (CheckBoxMouse->Checked)
{
DisplayLine("MouseUp: " + e->Button.ToString() +
" " + e->Location.ToString());
}
// The TextBox control was designed to change focus only on
// the primary click, so force focus to avoid user confusion.
if (!TextBoxInput->Focused)
{
TextBoxInput->Focus();
}
}
private:
void TextBoxInput_MouseEnter(Object^ sender, EventArgs^ e)
{
if (CheckBoxMouseEnter->Checked)
{
DisplayLine("MouseEnter event");
}
}
private:
void TextBoxInput_MouseHover(Object^ sender, EventArgs^ e)
{
if (CheckBoxMouseEnter->Checked)
{
DisplayLine("MouseHover event");
}
}
private:
void TextBoxInput_MouseLeave(Object^ sender, EventArgs^ e)
{
if (CheckBoxMouseEnter->Checked)
{
DisplayLine("MouseLeave event");
}
}
private:
void TextBoxInput_MouseWheel(Object^ sender,
MouseEventArgs^ e)
{
if (CheckBoxMouse->Checked)
{
DisplayLine("MouseWheel: " + e->Delta.ToString() +
" detents at " + e->Location.ToString());
}
}
private:
void TextBoxInput_MouseMove(Object^ sender,
MouseEventArgs^ e)
{
if (CheckBoxMouseMove->Checked)
{
DisplayLine("MouseMove: " + e->Button.ToString() + " " +
e->Location.ToString());
}
if (CheckBoxMousePoints->Checked)
{
Graphics^ g = TextBoxInput->CreateGraphics();
g->FillRectangle(Brushes::Black, e->Location.X,
e->Location.Y, 1, 1);
delete g;
}
}
private:
void TextBoxInput_MouseCaptureChanged(Object^ sender,
EventArgs^ e)
{
if (CheckBoxMouseDrag->Checked)
{
DisplayLine("MouseCaptureChanged event");
}
}
private:
void TextBoxInput_DragEnter(Object^ sender, DragEventArgs^ e)
{
if (CheckBoxMouseDrag->Checked)
{
Point^ pt = gcnew Point(e->X, e->Y);
DisplayLine("DragEnter: " +
CovertKeyStateToString(e->KeyState)
+ " at " + pt->ToString());
}
}
private:
void TextBoxInput_DragDrop(Object^ sender, DragEventArgs^ e)
{
if (CheckBoxMouseDrag->Checked)
{
Point^ pt = gcnew Point(e->X, e->Y);
DisplayLine("DragDrop: " +
CovertKeyStateToString(e->KeyState)
+ " at " + pt->ToString());
}
}
private:
void TextBoxInput_DragOver(Object^ sender, DragEventArgs^ e)
{
if (CheckBoxMouseDragOver->Checked)
{
Point^ pt = gcnew Point(e->X, e->Y);
DisplayLine("DragOver: " +
CovertKeyStateToString(e->KeyState)
+ " at " + pt->ToString());
}
// Allow if drop data is of type string.
if (!e->Data->GetDataPresent(String::typeid))
{
e->Effect = DragDropEffects::None;
}
else
{
e->Effect = DragDropEffects::Copy;
}
}
private:
void TextBoxInput_DragLeave(Object^ sender,
EventArgs^ e)
{
if (CheckBoxMouseDrag->Checked)
{
DisplayLine("DragLeave event");
}
}
private:
static String^ CovertKeyStateToString(int keyState)
{
String^ keyString = "None";
// Which button was pressed?
if ((keyState & 1) == 1)
{
keyString = "Left";
}
else if ((keyState & 2) == 2)
{
keyString = "Right";
}
else if ((keyState & 16) == 16)
{
keyString = "Middle";
}
// Are one or more modifier keys also pressed?
if ((keyState & 4) == 4)
{
keyString += "+SHIFT";
}
if ((keyState & 8) == 8)
{
keyString += "+CTRL";
}
if ((keyState & 32) == 32)
{
keyString += "+ALT";
}
return keyString;
}
private:
void TextBoxInput_Enter(Object^ sender, EventArgs^ e)
{
if (CheckBoxFocus->Checked)
{
DisplayLine("Enter event");
}
}
private:
void TextBoxInput_Leave(Object^ sender, EventArgs^ e)
{
if (CheckBoxFocus->Checked)
{
DisplayLine("Leave event");
}
}
private:
void TextBoxInput_GotFocus(Object^ sender, EventArgs^ e)
{
if (CheckBoxFocus->Checked)
{
DisplayLine("GotFocus event");
}
}
private:
void TextBoxInput_LostFocus(Object^ sender, EventArgs^ e)
{
if (CheckBoxFocus->Checked)
{
DisplayLine("LostFocus event");
}
}
private:
void TextBoxInput_Validated(Object^ sender, EventArgs^ e)
{
if (CheckBoxValidation->Checked)
{
DisplayLine("Validated event");
}
}
private:
void TextBoxInput_Validating(
Object^ sender, CancelEventArgs^ e)
{
if (CheckBoxValidation->Checked)
{
DisplayLine("Validating event");
}
}
private:
void CheckBoxToggleAll_CheckedChanged(
Object^ sender, EventArgs^ e)
{
if (dynamic_cast<CheckBox^>(sender))
{
CheckAllChildCheckBoxes(this, ((CheckBox^)sender)->Checked);
}
}
private:
void CheckBoxMouse_CheckedChanged(
Object^ sender, EventArgs^ e)
{
ConfigureCheckBoxSettings();
}
private:
void CheckBoxMouseDrag_CheckedChanged(
Object^ sender, EventArgs^ e)
{
ConfigureCheckBoxSettings();
}
private:
void CheckBoxKeyboard_CheckedChanged(
Object^ sender, EventArgs^ e)
{
ConfigureCheckBoxSettings();
}
private:
void CheckBoxMouseMove_CheckedChanged(
Object^ sender, EventArgs^ e)
{
ConfigureCheckBoxSettings();
}
// Reconcile dependencies between the check box
// selection choices.
private:
void ConfigureCheckBoxSettings()
{
// CheckBoxMouse is a top-level check box.
if (!CheckBoxMouse->Checked)
{
CheckBoxMouseEnter->Enabled = false;
CheckBoxMouseMove->Enabled = false;
CheckBoxMouseDrag->Enabled = false;
CheckBoxMouseDragOver->Enabled = false;
CheckBoxMousePoints->Enabled = false;
}
else
{
CheckBoxMouseEnter->Enabled = true;
CheckBoxMouseMove->Enabled = true;
CheckBoxMouseDrag->Enabled = true;
CheckBoxMousePoints->Enabled = true;
// Enable children depending on the state of the parent.
if (!CheckBoxMouseDrag->Checked)
{
CheckBoxMouseDragOver->Enabled = false;
}
else
{
CheckBoxMouseDragOver->Enabled = true;
}
}
if (!CheckBoxKeyboard->Checked)
{
CheckBoxKeyUpDown->Enabled = false;
}
else
{
CheckBoxKeyUpDown->Enabled = true;
}
}
private:
void LinkLabelDrag_MouseDown(Object^ sender, MouseEventArgs^ e)
{
String^ data = "Sample Data";
LinkLabelDrag->DoDragDrop(data, DragDropEffects::All);
}
private:
void LinkLabelDrag_GiveFeedback(Object^ sender,
GiveFeedbackEventArgs^ e)
{
if ((e->Effect & DragDropEffects::Copy) ==
DragDropEffects::Copy)
{
LinkLabelDrag->Cursor = Cursors::HSplit;
}
else
{
LinkLabelDrag->Cursor = Cursors::Default;
}
}
};
}
[STAThread]
int main()
{
Application::EnableVisualStyles();
Application::Run(gcnew UserInputWalkthrough::Form1());
}
using System;
using System.Drawing;
using System.ComponentModel;
using System.Windows.Forms;
namespace UserInputWalkthrough
{
public class Form1 : Form
{
Label Label1 = new Label();
Label Label2 = new Label();
TextBox TextBoxOutput = new TextBox();
TextBox TextBoxInput = new TextBox();
GroupBox GroupBoxEvents = new GroupBox();
Button ButtonClear = new Button();
LinkLabel LinkLabelDrag = new LinkLabel();
CheckBox CheckBoxToggleAll = new CheckBox();
CheckBox CheckBoxMouse = new CheckBox();
CheckBox CheckBoxMouseEnter = new CheckBox();
CheckBox CheckBoxMouseMove = new CheckBox();
CheckBox CheckBoxMousePoints = new CheckBox();
CheckBox CheckBoxMouseDrag = new CheckBox();
CheckBox CheckBoxMouseDragOver = new CheckBox();
CheckBox CheckBoxKeyboard = new CheckBox();
CheckBox CheckBoxKeyUpDown = new CheckBox();
CheckBox CheckBoxFocus = new CheckBox();
CheckBox CheckBoxValidation = new CheckBox();
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.Run(new Form1());
}
public Form1()
: base()
{
this.Load += new EventHandler(Form1_Load);
}
private void Form1_Load(object sender, EventArgs e)
{
this.GroupBoxEvents.SuspendLayout();
this.SuspendLayout();
Label1.Location = new Point(232, 12);
Label1.Size = new Size(98, 14);
Label1.AutoSize = true;
Label1.Text = "Generated Events:";
Label2.Location = new Point(13, 12);
Label2.Size = new Size(95, 14);
Label2.AutoSize = true;
Label2.Text = "User Input Target:";
TextBoxInput.Location = new Point(13, 34);
TextBoxInput.Size = new Size(200, 200);
TextBoxInput.AllowDrop = true;
TextBoxInput.AutoSize = false;
TextBoxInput.Cursor = Cursors.Cross;
TextBoxInput.Multiline = true;
TextBoxInput.TabIndex = 1;
LinkLabelDrag.AllowDrop = true;
LinkLabelDrag.AutoSize = true;
LinkLabelDrag.Location = new Point(13, 240);
LinkLabelDrag.Size = new Size(175, 14);
LinkLabelDrag.TabIndex = 2;
LinkLabelDrag.TabStop = true;
LinkLabelDrag.Text = "Click here to use as a drag source";
LinkLabelDrag.Links.Add(new LinkLabel.Link(0,
LinkLabelDrag.Text.Length));
GroupBoxEvents.Location = new Point(13, 281);
GroupBoxEvents.Size = new Size(200, 302);
GroupBoxEvents.Text = "Event Filter:";
GroupBoxEvents.TabStop = true;
GroupBoxEvents.TabIndex = 3;
GroupBoxEvents.Controls.Add(CheckBoxMouseEnter);
GroupBoxEvents.Controls.Add(CheckBoxToggleAll);
GroupBoxEvents.Controls.Add(CheckBoxMousePoints);
GroupBoxEvents.Controls.Add(CheckBoxKeyUpDown);
GroupBoxEvents.Controls.Add(CheckBoxMouseDragOver);
GroupBoxEvents.Controls.Add(CheckBoxMouseDrag);
GroupBoxEvents.Controls.Add(CheckBoxValidation);
GroupBoxEvents.Controls.Add(CheckBoxMouseMove);
GroupBoxEvents.Controls.Add(CheckBoxFocus);
GroupBoxEvents.Controls.Add(CheckBoxKeyboard);
GroupBoxEvents.Controls.Add(CheckBoxMouse);
CheckBoxToggleAll.AutoSize = true;
CheckBoxToggleAll.Location = new Point(7, 20);
CheckBoxToggleAll.Size = new Size(122, 17);
CheckBoxToggleAll.TabIndex = 4;
CheckBoxToggleAll.Text = "Toggle All Events";
CheckBoxMouse.AutoSize = true;
CheckBoxMouse.Location = new Point(7, 45);
CheckBoxMouse.Size = new Size(137, 17);
CheckBoxMouse.TabIndex = 5;
CheckBoxMouse.Text = "Mouse and Click Events";
CheckBoxMouseEnter.AutoSize = true;
CheckBoxMouseEnter.Location = new Point(26, 69);
CheckBoxMouseEnter.Margin = new Padding(3, 3, 3, 1);
CheckBoxMouseEnter.Size = new System.Drawing.Size(151, 17);
CheckBoxMouseEnter.TabIndex = 6;
CheckBoxMouseEnter.Text = "Mouse Enter/Hover/Leave";
CheckBoxMouseMove.AutoSize = true;
CheckBoxMouseMove.Location = new Point(26, 89);
CheckBoxMouseMove.Margin = new Padding(3, 2, 3, 3);
CheckBoxMouseMove.Size = new Size(120, 17);
CheckBoxMouseMove.TabIndex = 7;
CheckBoxMouseMove.Text = "Mouse Move Events";
CheckBoxMousePoints.AutoSize = true;
CheckBoxMousePoints.Location = new Point(26, 112);
CheckBoxMousePoints.Margin = new Padding(3, 3, 3, 1);
CheckBoxMousePoints.Size = new Size(141, 17);
CheckBoxMousePoints.TabIndex = 8;
CheckBoxMousePoints.Text = "Draw Mouse Points";
CheckBoxMouseDrag.AutoSize = true;
CheckBoxMouseDrag.Location = new Point(26, 135);
CheckBoxMouseDrag.Margin = new Padding(3, 1, 3, 3);
CheckBoxMouseDrag.Size = new Size(151, 17);
CheckBoxMouseDrag.TabIndex = 9;
CheckBoxMouseDrag.Text = "Mouse Drag && Drop Events";
CheckBoxMouseDragOver.AutoSize = true;
CheckBoxMouseDragOver.Location = new Point(44, 159);
CheckBoxMouseDragOver.Size = new Size(142, 17);
CheckBoxMouseDragOver.TabIndex = 10;
CheckBoxMouseDragOver.Text = "Mouse Drag Over Events";
CheckBoxKeyboard.AutoSize = true;
CheckBoxKeyboard.Location = new Point(8, 184);
CheckBoxKeyboard.Size = new Size(103, 17);
CheckBoxKeyboard.TabIndex = 11;
CheckBoxKeyboard.Text = "Keyboard Events";
CheckBoxKeyUpDown.AutoSize = true;
CheckBoxKeyUpDown.Location = new Point(26, 207);
CheckBoxKeyUpDown.Margin = new Padding(3, 3, 3, 1);
CheckBoxKeyUpDown.Size = new Size(133, 17);
CheckBoxKeyUpDown.TabIndex = 12;
CheckBoxKeyUpDown.Text = "Key Up && Down Events";
CheckBoxFocus.AutoSize = true;
CheckBoxFocus.Location = new Point(8, 233);
CheckBoxFocus.Margin = new Padding(3, 2, 3, 3);
CheckBoxFocus.Size = new Size(146, 17);
CheckBoxFocus.TabIndex = 13;
CheckBoxFocus.Text = "Focus && Activation Events";
CheckBoxValidation.AutoSize = true;
CheckBoxValidation.Location = new Point(8, 257);
CheckBoxValidation.Size = new Size(104, 17);
CheckBoxValidation.TabIndex = 14;
CheckBoxValidation.Text = "Validation Events";
TextBoxOutput.Location = new Point(232, 34);
TextBoxOutput.Size = new Size(308, 510);
TextBoxOutput.Multiline = true;
TextBoxOutput.CausesValidation = false;
TextBoxOutput.ReadOnly = true;
TextBoxOutput.ScrollBars = ScrollBars.Vertical;
TextBoxOutput.TabIndex = 15;
TextBoxOutput.WordWrap = false;
ButtonClear.Location = new Point(232, 560);
ButtonClear.Size = new Size(308, 23);
ButtonClear.TabIndex = 16;
ButtonClear.Text = "Clear Event List";
this.ClientSize = new Size(552, 595);
this.Controls.Add(LinkLabelDrag);
this.Controls.Add(ButtonClear);
this.Controls.Add(GroupBoxEvents);
this.Controls.Add(Label1);
this.Controls.Add(Label2);
this.Controls.Add(TextBoxInput);
this.Controls.Add(TextBoxOutput);
this.Text = "User Input Events";
ButtonClear.Click +=
new EventHandler(ButtonClear_Click);
TextBoxInput.KeyDown +=
new KeyEventHandler(TextBoxInput_KeyDown);
TextBoxInput.KeyPress +=
new KeyPressEventHandler(TextBoxInput_KeyPress);
TextBoxInput.KeyUp +=
new KeyEventHandler(TextBoxInput_KeyUp);
TextBoxInput.Click +=
new EventHandler(TextBoxInput_Click);
TextBoxInput.DoubleClick +=
new EventHandler(TextBoxInput_DoubleClick);
TextBoxInput.MouseClick +=
new MouseEventHandler(TextBoxInput_MouseClick);
TextBoxInput.MouseDoubleClick +=
new MouseEventHandler(TextBoxInput_MouseDoubleClick);
TextBoxInput.MouseDown +=
new MouseEventHandler(TextBoxInput_MouseDown);
TextBoxInput.MouseUp +=
new MouseEventHandler(TextBoxInput_MouseUp);
TextBoxInput.MouseEnter +=
new EventHandler(TextBoxInput_MouseEnter);
TextBoxInput.MouseHover +=
new EventHandler(TextBoxInput_MouseHover);
TextBoxInput.MouseLeave +=
new EventHandler(TextBoxInput_MouseLeave);
TextBoxInput.MouseWheel +=
new MouseEventHandler(TextBoxInput_MouseWheel);
TextBoxInput.MouseMove +=
new MouseEventHandler(TextBoxInput_MouseMove);
TextBoxInput.MouseCaptureChanged +=
new EventHandler(TextBoxInput_MouseCaptureChanged);
TextBoxInput.DragEnter +=
new DragEventHandler(TextBoxInput_DragEnter);
TextBoxInput.DragDrop +=
new DragEventHandler(TextBoxInput_DragDrop);
TextBoxInput.DragOver +=
new DragEventHandler(TextBoxInput_DragOver);
TextBoxInput.DragLeave +=
new EventHandler(TextBoxInput_DragLeave);
TextBoxInput.Enter +=
new EventHandler(TextBoxInput_Enter);
TextBoxInput.Leave +=
new EventHandler(TextBoxInput_Leave);
TextBoxInput.GotFocus +=
new EventHandler(TextBoxInput_GotFocus);
TextBoxInput.LostFocus +=
new EventHandler(TextBoxInput_LostFocus);
TextBoxInput.Validated +=
new EventHandler(TextBoxInput_Validated);
TextBoxInput.Validating +=
new CancelEventHandler(TextBoxInput_Validating);
LinkLabelDrag.MouseDown +=
new MouseEventHandler(LinkLabelDrag_MouseDown);
LinkLabelDrag.GiveFeedback +=
new GiveFeedbackEventHandler(LinkLabelDrag_GiveFeedback);
CheckBoxToggleAll.CheckedChanged +=
new EventHandler(CheckBoxToggleAll_CheckedChanged);
CheckBoxMouse.CheckedChanged +=
new EventHandler(CheckBoxMouse_CheckedChanged);
CheckBoxMouseDrag.CheckedChanged +=
new EventHandler(CheckBoxMouseDrag_CheckedChanged);
CheckBoxMouseEnter.CheckedChanged +=
new EventHandler(CheckBoxMouseMove_CheckedChanged);
CheckBoxMouseMove.CheckedChanged +=
new EventHandler(CheckBoxMouseMove_CheckedChanged);
CheckBoxKeyboard.CheckedChanged +=
new EventHandler(CheckBoxKeyboard_CheckedChanged);
this.GroupBoxEvents.ResumeLayout(false);
this.GroupBoxEvents.PerformLayout();
this.ResumeLayout(false);
this.PerformLayout();
CheckAllChildCheckBoxes(this, true);
}
// Recursively search the form for all contained checkboxes and
// initially check them
private void CheckAllChildCheckBoxes(Control parent, bool value)
{
CheckBox box;
foreach (Control currentControl in parent.Controls)
{
if (currentControl is CheckBox)
{
box = (CheckBox)currentControl;
box.Checked = value;
}
// Recurse if control contains other controls
if (currentControl.Controls.Count > 0)
{
CheckAllChildCheckBoxes(currentControl, value);
}
}
}
// All-purpose method for displaying a line of text in one of the
// text boxes.
private void DisplayLine(string line)
{
TextBoxOutput.AppendText(line);
TextBoxOutput.AppendText(Environment.NewLine);
}
// Click event handler for the button that clears the text box.
private void ButtonClear_Click(object sender, EventArgs e)
{
TextBoxOutput.Invalidate();
TextBoxOutput.Clear();
}
private void TextBoxInput_KeyDown(object sender, KeyEventArgs e)
{
if (CheckBoxKeyUpDown.Checked)
{
DisplayLine("KeyDown: " + e.KeyData.ToString());
}
}
private void TextBoxInput_KeyUp(object sender, KeyEventArgs e)
{
if (CheckBoxKeyUpDown.Checked)
{
DisplayLine("KeyUp: " + e.KeyData.ToString());
}
}
private void TextBoxInput_KeyPress(object sender,
KeyPressEventArgs e)
{
if (CheckBoxKeyboard.Checked)
{
if (Char.IsWhiteSpace(e.KeyChar))
{
DisplayLine("KeyPress: WS");
}
else
{
DisplayLine("KeyPress: " + e.KeyChar.ToString());
}
}
}
private void TextBoxInput_Click(object sender, EventArgs e)
{
if (CheckBoxMouse.Checked)
{
DisplayLine("Click event");
}
}
private void TextBoxInput_DoubleClick(object sender, EventArgs e)
{
if (CheckBoxMouse.Checked)
{
DisplayLine("DoubleClick event");
}
}
private void TextBoxInput_MouseClick(object sender, MouseEventArgs e)
{
if (CheckBoxMouse.Checked)
{
DisplayLine("MouseClick: " + e.Button.ToString() +
" " + e.Location.ToString());
}
}
private void TextBoxInput_MouseDoubleClick(object sender,
MouseEventArgs e)
{
if (CheckBoxMouse.Checked)
{
DisplayLine("MouseDoubleClick: " + e.Button.ToString() +
" " + e.Location.ToString());
}
}
private void TextBoxInput_MouseDown(object sender,
MouseEventArgs e)
{
if (CheckBoxMouse.Checked)
{
DisplayLine("MouseDown: " + e.Button.ToString() +
" " + e.Location.ToString());
}
}
private void TextBoxInput_MouseUp(object sender,
MouseEventArgs e)
{
if (CheckBoxMouse.Checked)
{
DisplayLine("MouseUp: " + e.Button.ToString() +
" " + e.Location.ToString());
}
// The TextBox control was designed to change focus only on
// the primary click, so force focus to avoid user confusion.
if (!TextBoxInput.Focused)
{
TextBoxInput.Focus();
}
}
private void TextBoxInput_MouseEnter(object sender, EventArgs e)
{
if (CheckBoxMouseEnter.Checked)
{
DisplayLine("MouseEnter event");
}
}
private void TextBoxInput_MouseHover(object sender, EventArgs e)
{
if (CheckBoxMouseEnter.Checked)
{
DisplayLine("MouseHover event");
}
}
private void TextBoxInput_MouseLeave(object sender, EventArgs e)
{
if (CheckBoxMouseEnter.Checked)
{
DisplayLine("MouseLeave event");
}
}
private void TextBoxInput_MouseWheel(object sender,
MouseEventArgs e)
{
if (CheckBoxMouse.Checked)
{
DisplayLine("MouseWheel: " + e.Delta.ToString() +
" detents at " + e.Location.ToString());
}
}
private void TextBoxInput_MouseMove(object sender,
MouseEventArgs e)
{
if (CheckBoxMouseMove.Checked)
{
DisplayLine("MouseMove: " + e.Button.ToString() + " " +
e.Location.ToString());
}
if (CheckBoxMousePoints.Checked)
{
Graphics g = TextBoxInput.CreateGraphics();
g.FillRectangle(Brushes.Black, e.Location.X,
e.Location.Y, 1, 1);
g.Dispose();
}
}
private void TextBoxInput_MouseCaptureChanged(object sender,
EventArgs e)
{
if (CheckBoxMouseDrag.Checked)
{
DisplayLine("MouseCaptureChanged event");
}
}
private void TextBoxInput_DragEnter(object sender,
DragEventArgs e)
{
if (CheckBoxMouseDrag.Checked)
{
Point pt = new Point(e.X, e.Y);
DisplayLine("DragEnter: " +
CovertKeyStateToString(e.KeyState)
+ " at " + pt.ToString());
}
}
private void TextBoxInput_DragDrop(object sender,
DragEventArgs e)
{
if (CheckBoxMouseDrag.Checked)
{
Point pt = new Point(e.X, e.Y);
DisplayLine("DragDrop: " +
CovertKeyStateToString(e.KeyState)
+ " at " + pt.ToString());
}
}
private void TextBoxInput_DragOver(object sender,
DragEventArgs e)
{
if (CheckBoxMouseDragOver.Checked)
{
Point pt = new Point(e.X, e.Y);
DisplayLine("DragOver: " +
CovertKeyStateToString(e.KeyState)
+ " at " + pt.ToString());
}
// Allow if drop data is of type string.
if (!e.Data.GetDataPresent(typeof(String)))
{
e.Effect = DragDropEffects.None;
}
else
{
e.Effect = DragDropEffects.Copy;
}
}
private void TextBoxInput_DragLeave(object sender,
EventArgs e)
{
if (CheckBoxMouseDrag.Checked)
{
DisplayLine("DragLeave event");
}
}
private string CovertKeyStateToString(int keyState)
{
string keyString = "None";
// Which button was pressed?
if ((keyState & 1) == 1)
{
keyString = "Left";
}
else if ((keyState & 2) == 2)
{
keyString = "Right";
}
else if ((keyState & 16) == 16)
{
keyString = "Middle";
}
// Are one or more modifier keys also pressed?
if ((keyState & 4) == 4)
{
keyString += "+SHIFT";
}
if ((keyState & 8) == 8)
{
keyString += "+CTRL";
}
if ((keyState & 32) == 32)
{
keyString += "+ALT";
}
return keyString;
}
private void TextBoxInput_Enter(object sender, EventArgs e)
{
if (CheckBoxFocus.Checked)
{
DisplayLine("Enter event");
}
}
private void TextBoxInput_Leave(object sender, EventArgs e)
{
if (CheckBoxFocus.Checked)
{
DisplayLine("Leave event");
}
}
private void TextBoxInput_GotFocus(object sender, EventArgs e)
{
if (CheckBoxFocus.Checked)
{
DisplayLine("GotFocus event");
}
}
private void TextBoxInput_LostFocus(object sender, EventArgs e)
{
if (CheckBoxFocus.Checked)
{
DisplayLine("LostFocus event");
}
}
private void TextBoxInput_Validated(object sender, EventArgs e)
{
if (CheckBoxValidation.Checked)
{
DisplayLine("Validated event");
}
}
private void TextBoxInput_Validating(
object sender, CancelEventArgs e)
{
if (CheckBoxValidation.Checked)
{
DisplayLine("Validating event");
}
}
private void CheckBoxToggleAll_CheckedChanged(
object sender, EventArgs e)
{
if (sender is CheckBox)
{
CheckAllChildCheckBoxes(this, ((CheckBox)sender).Checked);
}
}
private void CheckBoxMouse_CheckedChanged(
object sender, EventArgs e)
{
ConfigureCheckBoxSettings();
}
private void CheckBoxMouseDrag_CheckedChanged(
object sender, EventArgs e)
{
ConfigureCheckBoxSettings();
}
private void CheckBoxKeyboard_CheckedChanged(
object sender, EventArgs e)
{
ConfigureCheckBoxSettings();
}
private void CheckBoxMouseMove_CheckedChanged(
object sender, EventArgs e)
{
ConfigureCheckBoxSettings();
}
// Reconcile dependencies between the check box
// selection choices.
private void ConfigureCheckBoxSettings()
{
// CheckBoxMouse is a top-level check box.
if (!CheckBoxMouse.Checked)
{
CheckBoxMouseEnter.Enabled = false;
CheckBoxMouseMove.Enabled = false;
CheckBoxMouseDrag.Enabled = false;
CheckBoxMouseDragOver.Enabled = false;
CheckBoxMousePoints.Enabled = false;
}
else
{
CheckBoxMouseEnter.Enabled = true;
CheckBoxMouseMove.Enabled = true;
CheckBoxMouseDrag.Enabled = true;
CheckBoxMousePoints.Enabled = true;
// Enable children depending on the state of the parent.
if (!CheckBoxMouseDrag.Checked)
{
CheckBoxMouseDragOver.Enabled = false;
}
else
{
CheckBoxMouseDragOver.Enabled = true;
}
}
if (!CheckBoxKeyboard.Checked)
{
CheckBoxKeyUpDown.Enabled = false;
}
else
{
CheckBoxKeyUpDown.Enabled = true;
}
}
private void LinkLabelDrag_MouseDown(object sender,
MouseEventArgs e)
{
string data = "Sample Data";
LinkLabelDrag.DoDragDrop(data, DragDropEffects.All);
}
private void LinkLabelDrag_GiveFeedback(object sender,
GiveFeedbackEventArgs e)
{
if ((e.Effect & DragDropEffects.Copy) ==
DragDropEffects.Copy)
{
LinkLabelDrag.Cursor = Cursors.HSplit;
}
else
{
LinkLabelDrag.Cursor = Cursors.Default;
}
}
}
}
Imports System.Drawing
Imports System.ComponentModel
Imports System.Windows.Forms
Namespace UserInputWalkthrough
Public Class Form1
Inherits Form
Dim Label1 As New Label
Dim Label2 As New Label
Dim TextBoxOutput As New TextBox
Dim WithEvents TextBoxInput As New TextBox
Dim WithEvents GroupBoxEvents As New GroupBox
Dim WithEvents ButtonClear As New Button
Dim WithEvents LinkLabelDrag As New LinkLabel
Dim WithEvents CheckBoxToggleAll As New CheckBox
Dim WithEvents CheckBoxMouse As New CheckBox
Dim WithEvents CheckBoxMouseEnter As New CheckBox
Dim WithEvents CheckBoxMouseMove As New CheckBox
Dim WithEvents CheckBoxMousePoints As New CheckBox
Dim WithEvents CheckBoxMouseDrag As New CheckBox
Dim WithEvents CheckBoxMouseDragOver As New CheckBox
Dim WithEvents CheckBoxKeyboard As New CheckBox
Dim WithEvents CheckBoxKeyUpDown As New CheckBox
Dim WithEvents CheckBoxFocus As New CheckBox
Dim WithEvents CheckBoxValidation As New CheckBox
<STAThread()> _
Shared Sub Main()
Application.EnableVisualStyles()
Application.Run(New Form1())
End Sub
Public Sub New()
MyBase.New()
End Sub
Private Sub Form1_Load(ByVal sender As Object, _
ByVal e As System.EventArgs) Handles MyBase.Load
Me.GroupBoxEvents.SuspendLayout()
Me.SuspendLayout()
Label1.Location = New Point(232, 12)
Label1.Size = New Size(98, 14)
Label1.AutoSize = True
Label1.Text = "Generated Events:"
Label2.Location = New Point(13, 12)
Label2.Size = New Size(95, 14)
Label2.AutoSize = True
Label2.Text = "User Input Target:"
TextBoxInput.Location = New Point(13, 34)
TextBoxInput.Size = New Size(200, 200)
TextBoxInput.AllowDrop = True
TextBoxInput.AutoSize = False
TextBoxInput.Cursor = Cursors.Cross
TextBoxInput.Multiline = True
TextBoxInput.TabIndex = 1
LinkLabelDrag.AllowDrop = True
LinkLabelDrag.AutoSize = True
LinkLabelDrag.Location = New Point(13, 240)
LinkLabelDrag.Size = New Size(175, 14)
LinkLabelDrag.TabIndex = 2
LinkLabelDrag.TabStop = True
LinkLabelDrag.Text = "Click here to use as a drag source"
LinkLabelDrag.Links.Add(New LinkLabel.Link(0, _
LinkLabelDrag.Text.Length))
GroupBoxEvents.Location = New Point(13, 281)
GroupBoxEvents.Size = New Size(200, 302)
GroupBoxEvents.TabIndex = 3
GroupBoxEvents.TabStop = False
GroupBoxEvents.Text = "Event Filter:"
GroupBoxEvents.Controls.Add(CheckBoxMouseEnter)
GroupBoxEvents.Controls.Add(CheckBoxToggleAll)
GroupBoxEvents.Controls.Add(CheckBoxMousePoints)
GroupBoxEvents.Controls.Add(CheckBoxKeyUpDown)
GroupBoxEvents.Controls.Add(CheckBoxMouseDragOver)
GroupBoxEvents.Controls.Add(CheckBoxMouseDrag)
GroupBoxEvents.Controls.Add(CheckBoxValidation)
GroupBoxEvents.Controls.Add(CheckBoxMouseMove)
GroupBoxEvents.Controls.Add(CheckBoxFocus)
GroupBoxEvents.Controls.Add(CheckBoxKeyboard)
GroupBoxEvents.Controls.Add(CheckBoxMouse)
CheckBoxToggleAll.AutoSize = True
CheckBoxToggleAll.Location = New Point(7, 20)
CheckBoxToggleAll.Size = New Size(122, 17)
CheckBoxToggleAll.TabIndex = 4
CheckBoxToggleAll.Text = "Toggle All Events"
CheckBoxMouse.AutoSize = True
CheckBoxMouse.Location = New Point(7, 45)
CheckBoxMouse.Size = New Size(137, 17)
CheckBoxMouse.TabIndex = 5
CheckBoxMouse.Text = "Mouse and Click Events"
CheckBoxMouseEnter.AutoSize = True
CheckBoxMouseEnter.Location = New Point(26, 69)
CheckBoxMouseEnter.Margin = New Padding(3, 3, 3, 1)
CheckBoxMouseEnter.Size = New System.Drawing.Size(151, 17)
CheckBoxMouseEnter.TabIndex = 6
CheckBoxMouseEnter.Text = "Mouse Enter/Hover/Leave"
CheckBoxMouseMove.AutoSize = True
CheckBoxMouseMove.Location = New Point(26, 89)
CheckBoxMouseMove.Margin = New Padding(3, 2, 3, 3)
CheckBoxMouseMove.Size = New Size(120, 17)
CheckBoxMouseMove.TabIndex = 7
CheckBoxMouseMove.Text = "Mouse Move Events"
CheckBoxMousePoints.AutoSize = True
CheckBoxMousePoints.Location = New Point(26, 112)
CheckBoxMousePoints.Margin = New Padding(3, 3, 3, 1)
CheckBoxMousePoints.Size = New Size(141, 17)
CheckBoxMousePoints.TabIndex = 8
CheckBoxMousePoints.Text = "Draw Mouse Points"
CheckBoxMouseDrag.AutoSize = True
CheckBoxMouseDrag.Location = New Point(26, 135)
CheckBoxMouseDrag.Margin = New Padding(3, 1, 3, 3)
CheckBoxMouseDrag.Size = New Size(151, 17)
CheckBoxMouseDrag.TabIndex = 9
CheckBoxMouseDrag.Text = "Mouse Drag && Drop Events"
CheckBoxMouseDragOver.AutoSize = True
CheckBoxMouseDragOver.Location = New Point(44, 159)
CheckBoxMouseDragOver.Size = New Size(142, 17)
CheckBoxMouseDragOver.TabIndex = 10
CheckBoxMouseDragOver.Text = "Mouse Drag Over Events"
CheckBoxKeyboard.AutoSize = True
CheckBoxKeyboard.Location = New Point(8, 184)
CheckBoxKeyboard.Size = New Size(103, 17)
CheckBoxKeyboard.TabIndex = 11
CheckBoxKeyboard.Text = "Keyboard Events"
CheckBoxKeyUpDown.AutoSize = True
CheckBoxKeyUpDown.Location = New Point(26, 207)
CheckBoxKeyUpDown.Margin = New Padding(3, 3, 3, 1)
CheckBoxKeyUpDown.Size = New Size(133, 17)
CheckBoxKeyUpDown.TabIndex = 12
CheckBoxKeyUpDown.Text = "Key Up && Down Events"
CheckBoxFocus.AutoSize = True
CheckBoxFocus.Location = New Point(8, 233)
CheckBoxFocus.Margin = New Padding(3, 2, 3, 3)
CheckBoxFocus.Size = New Size(146, 17)
CheckBoxFocus.TabIndex = 13
CheckBoxFocus.Text = "Focus && Activation Events"
CheckBoxValidation.AutoSize = True
CheckBoxValidation.Location = New Point(8, 257)
CheckBoxValidation.Size = New Size(104, 17)
CheckBoxValidation.TabIndex = 14
CheckBoxValidation.Text = "Validation Events"
TextBoxOutput.Location = New Point(232, 34)
TextBoxOutput.Size = New Size(308, 510)
TextBoxOutput.Multiline = True
TextBoxOutput.CausesValidation = False
TextBoxOutput.ReadOnly = True
TextBoxOutput.ScrollBars = ScrollBars.Vertical
TextBoxOutput.TabIndex = 15
TextBoxOutput.WordWrap = False
ButtonClear.Location = New Point(232, 560)
ButtonClear.Size = New Size(308, 23)
ButtonClear.TabIndex = 16
ButtonClear.Text = "Clear Event List"
Me.ClientSize = New Size(552, 595)
Me.Controls.Add(LinkLabelDrag)
Me.Controls.Add(ButtonClear)
Me.Controls.Add(GroupBoxEvents)
Me.Controls.Add(Label1)
Me.Controls.Add(Label2)
Me.Controls.Add(TextBoxInput)
Me.Controls.Add(TextBoxOutput)
Me.Text = "User Input Events"
Me.GroupBoxEvents.ResumeLayout(False)
Me.GroupBoxEvents.PerformLayout()
Me.ResumeLayout(False)
Me.PerformLayout()
CheckAllChildCheckBoxes(Me, True)
End Sub
' Recursively search the form for all contained checkboxes and
' initially check them
Private Sub CheckAllChildCheckBoxes(ByRef parent As Control, _
ByVal value As Boolean)
Dim currentControl As Control
Dim box As CheckBox
For Each currentControl In parent.Controls
box = TryCast(currentControl, CheckBox)
If box IsNot Nothing Then
box.Checked = value
End If
'Recurse if control contains other controls
If currentControl.Controls.Count > 0 Then
CheckAllChildCheckBoxes(currentControl, value)
End If
Next
End Sub
' All-purpose method for displaying a line of text in one of the
' text boxes.
Private Sub DisplayLine(ByRef line As String)
TextBoxOutput.AppendText(line)
TextBoxOutput.AppendText(ControlChars.NewLine)
End Sub
' Click event handler for the button that clears the text box.
Private Sub ButtonClear_Click(ByVal sender As Object, _
ByVal e As System.EventArgs) Handles ButtonClear.Click
TextBoxOutput.Invalidate()
TextBoxOutput.Clear()
End Sub
Private Sub TextBoxInput_KeyDown(ByVal sender As Object, _
ByVal e As KeyEventArgs) Handles TextBoxInput.KeyDown
If CheckBoxKeyUpDown.Checked = True Then
DisplayLine("KeyDown: " + e.KeyData.ToString())
End If
End Sub
Private Sub TextBoxInput_KeyUp(ByVal sender As Object, _
ByVal e As KeyEventArgs) Handles TextBoxInput.KeyUp
If CheckBoxKeyUpDown.Checked = True Then
DisplayLine("KeyUp: " + e.KeyData.ToString())
End If
End Sub
Private Sub TextBoxInput_KeyPress(ByVal sender As Object, _
ByVal e As KeyPressEventArgs) Handles TextBoxInput.KeyPress
If CheckBoxKeyboard.Checked = True Then
If Char.IsWhiteSpace(e.KeyChar) Then
Dim keyVal As Integer
keyVal = AscW(e.KeyChar)
DisplayLine("KeyPress: WS-" + keyVal.ToString())
Else
DisplayLine("KeyPress: " + e.KeyChar.ToString())
End If
End If
End Sub
Private Sub TextBoxInput_Click(ByVal sender As Object, _
ByVal e As EventArgs) Handles TextBoxInput.Click
If CheckBoxMouse.Checked = True Then
DisplayLine("Click event")
End If
End Sub
Private Sub TextBoxInput_DoubleClick(ByVal sender As Object, _
ByVal e As EventArgs) Handles TextBoxInput.DoubleClick
If CheckBoxMouse.Checked = True Then
DisplayLine("DoubleClick event")
End If
End Sub
Private Sub TextBoxInput_MouseClick(ByVal sender As Object, _
ByVal e As MouseEventArgs) Handles TextBoxInput.MouseClick
If CheckBoxMouse.Checked = True Then
DisplayLine("MouseClick: " + e.Button.ToString() + _
" " + e.Location.ToString())
End If
End Sub
Private Sub TextBoxInput_MouseDoubleClick(ByVal sender As Object, _
ByVal e As MouseEventArgs) Handles TextBoxInput.MouseDoubleClick
If CheckBoxMouse.Checked = True Then
DisplayLine("MouseDoubleClick: " + e.Button.ToString() + _
" " + e.Location.ToString())
End If
End Sub
Private Sub TextBoxInput_MouseDown(ByVal sender As System.Object, _
ByVal e As MouseEventArgs) Handles TextBoxInput.MouseDown
If CheckBoxMouse.Checked = True Then
DisplayLine("MouseDown: " + e.Button.ToString() + _
" " + e.Location.ToString())
End If
End Sub
Private Sub TextBoxInput_MouseUp(ByVal sender As Object, _
ByVal e As MouseEventArgs) Handles TextBoxInput.MouseUp
If CheckBoxMouse.Checked = True Then
DisplayLine("MouseUp: " + e.Button.ToString() + _
" " + e.Location.ToString())
End If
' The TextBox control was designed to change focus only on
' the primary click, so force focus to avoid user confusion.
If TextBoxInput.Focused = False Then
TextBoxInput.Focus()
End If
End Sub
Private Sub TextBoxInput_MouseEnter(ByVal sender As Object, _
ByVal e As EventArgs) Handles TextBoxInput.MouseEnter
If CheckBoxMouseEnter.Checked = True Then
DisplayLine("MouseEnter event")
End If
End Sub
Private Sub TextBoxInput_MouseHover(ByVal sender As Object, _
ByVal e As EventArgs) Handles TextBoxInput.MouseHover
If CheckBoxMouseEnter.Checked = True Then
DisplayLine("MouseHover event")
End If
End Sub
Private Sub TextBoxInput_MouseLeave(ByVal sender As Object, _
ByVal e As EventArgs) Handles TextBoxInput.MouseLeave
If CheckBoxMouseEnter.Checked = True Then
DisplayLine("MouseLeave event")
End If
End Sub
Private Sub TextBoxInput_MouseWheel(ByVal sender As Object, _
ByVal e As MouseEventArgs) Handles TextBoxInput.MouseWheel
If CheckBoxMouse.Checked = True Then
DisplayLine("MouseWheel: " + e.Delta.ToString() + _
" detents at " + e.Location.ToString())
End If
End Sub
Private Sub TextBoxInput_MouseMove(ByVal sender As Object, _
ByVal e As MouseEventArgs) Handles TextBoxInput.MouseMove
If CheckBoxMouseMove.Checked = True Then
DisplayLine("MouseMove: " + e.Button.ToString() + " " + _
e.Location.ToString())
End If
If CheckBoxMousePoints.Checked = True Then
Dim g As Graphics = TextBoxInput.CreateGraphics()
g.FillRectangle(Brushes.Black, e.Location.X, _
e.Location.Y, 1, 1)
g.Dispose()
End If
End Sub
Private Sub TextBoxInput_MouseCaptureChanged( _
ByVal sender As Object, ByVal e As EventArgs) _
Handles TextBoxInput.MouseCaptureChanged
If CheckBoxMouseDrag.Checked = True Then
DisplayLine("MouseCaptureChanged event")
End If
End Sub
Private Sub TextBoxInput_DragEnter(ByVal sender As Object, _
ByVal e As DragEventArgs) Handles TextBoxInput.DragEnter
Dim pt As Point
If CheckBoxMouseDrag.Checked = True Then
pt = New Point(e.X, e.Y)
DisplayLine("DragEnter: " + _
CovertKeyStateToString(e.KeyState) _
+ " at " + pt.ToString())
End If
End Sub
Private Sub TextBoxInput_DragDrop(ByVal sender As Object, _
ByVal e As DragEventArgs) Handles TextBoxInput.DragDrop
If CheckBoxMouseDrag.Checked = True Then
Dim pt As Point
pt = New Point(e.X, e.Y)
DisplayLine("DragDrop: " + _
CovertKeyStateToString(e.KeyState) _
+ " at " + pt.ToString())
End If
End Sub
Private Sub TextBoxInput_DragOver(ByVal sender As Object, _
ByVal e As DragEventArgs) Handles TextBoxInput.DragOver
If CheckBoxMouseDragOver.Checked = True Then
Dim pt As Point
pt = New Point(e.X, e.Y)
DisplayLine("DragOver: " + _
CovertKeyStateToString(e.KeyState) _
+ " at " + pt.ToString())
End If
' Allow if drop data is of type string.
If Not (e.Data.GetDataPresent(GetType(String))) Then
e.Effect = DragDropEffects.None
Else
e.Effect = DragDropEffects.Copy
End If
End Sub
Private Sub TextBoxInput_DragLeave(ByVal sender As Object, _
ByVal e As EventArgs) Handles TextBoxInput.DragLeave
If CheckBoxMouseDrag.Checked = True Then
DisplayLine("DragLeave event")
End If
End Sub
Private Function CovertKeyStateToString(ByVal keyState As Integer) _
As String
Dim keyString As String = "None"
' Which button was pressed?
If ((keyState And 1) = 1) Then
keyString = "Left"
ElseIf ((keyState And 2) = 2) Then
keyString = "Right"
ElseIf ((keyState And 16) = 16) Then
keyString = "Middle"
End If
' Are one or more modifier keys also pressed?
If ((keyState And 4) = 4) Then
keyString += "+SHIFT"
End If
If ((keyState And 8) = 8) Then
keyString += "+CTRL"
End If
If ((keyState And 32) = 32) Then
keyString += "+ALT"
End If
Return keyString
End Function
Private Sub TextBoxInput_Enter(ByVal sender As Object, _
ByVal e As EventArgs) Handles TextBoxInput.Enter
If CheckBoxFocus.Checked = True Then
DisplayLine("Enter event")
End If
End Sub
Private Sub TextBoxInput_Leave(ByVal sender As Object, _
ByVal e As EventArgs) Handles TextBoxInput.Leave
If CheckBoxFocus.Checked = True Then
DisplayLine("Leave event")
End If
End Sub
Private Sub TextBoxInput_GotFocus(ByVal sender As Object, _
ByVal e As EventArgs) Handles TextBoxInput.GotFocus
If CheckBoxFocus.Checked = True Then
DisplayLine("GotFocus event")
End If
End Sub
Private Sub TextBoxInput_LostFocus(ByVal sender As Object, _
ByVal e As EventArgs) Handles TextBoxInput.LostFocus
If CheckBoxFocus.Checked = True Then
DisplayLine("LostFocus event")
End If
End Sub
Private Sub TextBoxInput_Validated(ByVal sender As Object, _
ByVal e As EventArgs) Handles TextBoxInput.Validated
If CheckBoxValidation.Checked = True Then
DisplayLine("Validated event")
End If
End Sub
Private Sub TextBoxInput_Validating(ByVal sender As Object, _
ByVal e As CancelEventArgs) _
Handles TextBoxInput.Validating
If CheckBoxValidation.Checked = True Then
DisplayLine("Validating event")
End If
End Sub
Private Sub CheckBoxToggleAll_CheckedChanged( _
ByVal sender As Object, ByVal e As EventArgs) _
Handles CheckBoxToggleAll.CheckedChanged
Dim cb As CheckBox
cb = TryCast(sender, CheckBox)
If cb IsNot Nothing Then
CheckAllChildCheckBoxes(Me, cb.Checked)
End If
End Sub
Private Sub CheckBoxMouse_CheckedChanged( _
ByVal sender As Object, ByVal e As EventArgs) _
Handles CheckBoxMouse.CheckedChanged
ConfigureCheckBoxSettings()
End Sub
Private Sub CheckBoxMouseDrag_CheckedChanged( _
ByVal sender As Object, ByVal e As EventArgs) _
Handles CheckBoxMouseDrag.CheckedChanged
ConfigureCheckBoxSettings()
End Sub
Private Sub CheckBoxKeyboard_CheckedChanged( _
ByVal sender As Object, ByVal e As EventArgs) _
Handles CheckBoxKeyboard.CheckedChanged
ConfigureCheckBoxSettings()
End Sub
Private Sub CheckBoxMouseMove_CheckedChanged( _
ByVal sender As Object, ByVal e As EventArgs) _
Handles CheckBoxMouseEnter.CheckedChanged, _
CheckBoxMouseMove.CheckedChanged
ConfigureCheckBoxSettings()
End Sub
' Reconcile dependencies between the check box
' selection choices.
Private Sub ConfigureCheckBoxSettings()
' CheckBoxMouse is a top-level check box.
If CheckBoxMouse.Checked = False Then
CheckBoxMouseEnter.Enabled = False
CheckBoxMouseMove.Enabled = False
CheckBoxMouseDrag.Enabled = False
CheckBoxMouseDragOver.Enabled = False
CheckBoxMousePoints.Enabled = False
Else
CheckBoxMouseEnter.Enabled = True
CheckBoxMouseMove.Enabled = True
CheckBoxMouseDrag.Enabled = True
CheckBoxMousePoints.Enabled = True
' Enable children depending on the state of the parent.
If CheckBoxMouseDrag.Checked = False Then
CheckBoxMouseDragOver.Enabled = False
Else
CheckBoxMouseDragOver.Enabled = True
End If
End If
If CheckBoxKeyboard.Checked = False Then
CheckBoxKeyUpDown.Enabled = False
Else
CheckBoxKeyUpDown.Enabled = True
End If
End Sub
Private Sub LinkLabelDrag_MouseDown(ByVal sender As Object, _
ByVal e As MouseEventArgs) Handles LinkLabelDrag.MouseDown
Dim data As String = "Sample Data"
LinkLabelDrag.DoDragDrop(data, DragDropEffects.All)
End Sub
Private Sub LinkLabelDrag_GiveFeedback(ByVal sender As Object, _
ByVal e As GiveFeedbackEventArgs) _
Handles LinkLabelDrag.GiveFeedback
If ((e.Effect And DragDropEffects.Copy) = _
DragDropEffects.Copy) Then
LinkLabelDrag.Cursor = Cursors.HSplit
Else
LinkLabelDrag.Cursor = Cursors.Default
End If
End Sub
End Class
End Namespace
Kompilieren des Codes
Für dieses Beispiel benötigen Sie Folgendes:
- Verweise auf die Assemblys "System", "System.Drawing" und "System.Windows.Forms".
Siehe auch
Zusammenarbeit auf GitHub
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