CMFCButton Class

Articolo
07/24/2011

The CMFCButton class adds functionality to the CButton class such as aligning button text, combining button text and an image, selecting a cursor, and specifying a tool tip.

class CMFCButton : public CButton

Members

Public Constructors

Name	Description
CMFCButton::CMFCButton	Default constructor.
CMFCButton::~CMFCButton	Destructor.

Public Methods

Name	Description
CMFCButton::CleanUp	Resets internal variables and frees allocated resources such as images, bitmaps, and icons.
CMFCButton::CreateObject	Used by the framework to create a dynamic instance of this class type.
CMFCButton::DrawItem	Called by the framework when a visual aspect of an owner-drawn button has changed. (Overrides CButton::DrawItem.)
CMFCButton::EnableFullTextTooltip	Specifies whether to display the full text of a tooltip in a large tooltip window or a truncated version of the text in a small tooltip window.
CMFCButton::EnableMenuFont	Specifies whether the button text font is the same as the application menu font.
CMFCButton::EnableWindowsTheming	Specifies whether the style of the button border corresponds to the current Windows theme.
CMFCButton::GetThisClass	Used by the framework to obtain a pointer to the CRuntimeClass object that is associated with this class type.
CMFCButton::GetToolTipCtrl	Returns a reference to the underlying tooltip control.
CMFCButton::IsAutoCheck	Indicates whether a check box or radio button is an automatic button.
CMFCButton::IsAutorepeatCommandMode	Indicates whether a button is set to auto-repeat mode.
CMFCButton::IsCheckBox	Indicates whether a button is a check box button.
CMFCButton::IsChecked	Indicates whether the current button is checked.
CMFCButton::IsHighlighted	Indicates whether a button is highlighted.
CMFCButton::IsPressed	Indicates whether a button is pushed and highlighted.
CMFCButton::IsPushed	Indicates whether a button is pushed.
CMFCButton::IsRadioButton	Indicates whether a button is a radio button.
CMFCButton::IsWindowsThemingEnabled	Indicates whether the style of the button border corresponds to the current Windows theme.
CMFCButton::OnDrawParentBackground	Draws the background of a button's parent in the specified area. (Overrides AFX_GLOBAL_DATA::DrawParentBackground.)
CMFCButton::PreTranslateMessage	Translates window messages before they are dispatched to the TranslateMessage and DispatchMessage Windows functions. (Overrides CWnd::PreTranslateMessage.)
CMFCButton::SetAutorepeatMode	Sets a button to auto-repeat mode.
CMFCButton::SetCheckedImage	Sets the image for a checked button.
CMFCButton::SetFaceColor	Sets the background color for the button text.
CMFCButton::SetImage	Sets the image for a button.
CMFCButton::SetMouseCursor	Sets the cursor image.
CMFCButton::SetMouseCursorHand	Sets the cursor to the image of a hand.
CMFCButton::SetStdImage	Uses a CMenuImages object to set the button image.
CMFCButton::SetTextColor	Sets the color of the button text for a button that is not selected.
CMFCButton::SetTextHotColor	Sets the color of the button text for a button that is selected.
CMFCButton::SetTooltip	Associates a tooltip with a button.
CMFCButton::SizeToContent	Resizes a button to contain its button text and image.

Protected Methods

Name	Description
CMFCButton::OnDraw	Called by the framework to draw a button.
CMFCButton::OnDrawBorder	Called by the framework to draw the border of a button.
CMFCButton::OnDrawFocusRect	Called by the framework to draw the focus rectangle for a button.
CMFCButton::OnDrawText	Called by the framework to draw the button text.
CMFCButton::OnFillBackground	Called by the framework to draw the background of the button text.
CMFCButton::SelectFont	Retrieves the font that is associated with the specified device context.

Data Members

Name	Description
CMFCButton::m_bDrawFocus	Indicates whether to draw a focus rectangle around a button.
CMFCButton::m_bHighlightChecked	Indicates whether to highlight a BS_CHECKBOX-style button when the cursor hovers over it.
CMFCButton::m_bRightImage	Indicates whether to display an image on the right side of the button.
CMFCButton::m_bTransparent	Indicates whether the button is transparent.
CMFCButton::m_nAlignStyle	Specifies the alignment of the button text.
CMFCButton::m_nFlatStyle	Specifies the style of the button, such as borderless, flat, semi-flat, or 3D.

Remarks

Other types of buttons are derived from the CMFCButton class, such as the CMFCURLLinkButton class, which supports hyperlinks, and the CMFCColorButton class, which supports a color picker dialog box.

The style of a CMFCButton object can be 3D, flat, semi-flat or no border. Button text can be aligned at the left, top, or center of a button. At run time, you can control whether the button displays text, an image, or text and an image. You can also specify that a particular cursor image be displayed when the cursor hovers over a button.

Create a button control either directly in your code, or by using the MFC Class Wizard tool and a dialog box template. If you create a button control directly, add a CMFCButton variable to your application, and then call the constructor and Create methods of the CMFCButton object. If you use the MFC Class Wizard, add a CButton variable to your application, and then change the type of the variable from CButton to CMFCButton.

To handle notification messages in a dialog box application, add a message map entry and an event handler for each notification. The notifications sent by a CMFCButton object are the same as those sent by a CButton object.

Example

The following example demonstrates how to configure the properties of the button by using various methods in the CMFCButton class. The example is part of the New Controls sample.

    CMFCButton m_Button;


...


    // int m_iImage
    // IDB_BTN1_32, IDB_BTN1_HOT_32, IDB_BTN1, IDB_BTN1_HOT are int macros that are #define.
    if (m_iImage == 1) 
    {
        m_Button.SetImage((HBITMAP) NULL);
    }
    else
    {
        m_Button.SetImage(IDB_BTN1_32, IDB_BTN1_HOT_32);
    }


...


    // int m_iImage
    if (m_iImage == 0)
    {
        m_Button.SetWindowText(_T(""));
    }
    else
    {
        m_Button.SetWindowText(_T("Button"));
    }


...


    // Resize the button.
    m_Button.SizeToContent();
    m_Button.EnableFullTextTooltip(true);
    // Use the application menu font at the button text font.
    m_Button.EnableMenuFont();
    // Use the current Windows theme to draw the button borders.
    m_Button.EnableWindowsTheming(true);
    // Set the button to auto-repeat mode.
    m_Button.SetAutorepeatMode();
    // Set the background color for the button text.
    m_Button.SetFaceColor(RGB(255,0,0),true);
    m_Button.SetTextColor(RGB(0,0,255));
    // Set the tooltip of the button.
    m_Button.SetTooltip(_T("this is a button!"));