Default Tab Control Message Processing
This section describes the message processing performed by a tab control. Messages specific to tab controls are discussed elsewhere and are, therefore, not included here.| Message
| Processing performed
|
| WM_CAPTURECHANGED
| Does nothing if the tab control released the mouse capture itself. If another
window captured the mouse and a button is held down, the command releases the
button.
|
| WM_CREATE
| Allocates and initializes an internal data structure. The control creates a
tool tip control if the TCS_TOOLTIPS style is specified.
|
| WM_DESTROY
| Frees resources allocated during WM_CREATE processing.
|
| WM_GETDLGCODE
| Returns a combination of the DLGC_WANTARROWS and DLGC_WANTCHARS values.
|
| WM_GETFONT
| Returns the handle of the font used for labels.
|
| WM_KEYDOWN
| Processes DIRECTION keys and changes the selection, if appropriate.
|
| WM_KILLFOCUS
| Invalidates the tab that has the focus, so it will be repainted to reflect an
unfocused state.
|
| WM_LBUTTONDOWN
| Forwards the message to the tool tip control, if any, and changes the
selection if the user is clicking a tab. If the user is clicking a button, the control
redraws the button to give a sunken appearance and captures the mouse.
If the user is clicking either a tab or button and the TCS_FOCUSONBUTTONDOWN style is specified, the control sets the focus to itself. |
| WM_LBUTTONUP
| Releases the mouse if a button was pressed. If the cursor is over the button
and is being held down, the control changes the selection accordingly and
redraws the button.
|
| WM_MOUSEMOVE
| Forwards the message to the tool tip control, if any. If the TCS_BUTTONS style
is specified and the mouse button is being held down after clicking, the
control may also redraw the affected button to give it a raised or sunken appearance.
|
| WM_NOTIFY
| Forwards notification messages sent by the tool tip control.
|
| WM_PAINT
| Draws a border around the display area (unless the TCS_BUTTONS style is
specified) and paints any tabs that intersect the invalid rectangle.
For each tab, it draws the body of each tab (or sends a WM_DRAWITEM message to the parent window) and then draws a border around the tab. If the wParam parameter is non-NULL, the control assumes that the value is an HDC and paints using that device context. |
| WM_RBUTTONDOWN
| Sends an NM_RCLICK notification message to the parent window.
|
| WM_SETFOCUS
| Invalidates the tab that has the focus so that it will be repainted to reflect
a focused state.
|
| WM_SETFONT
| Sets the font used for labels.
|
| WM_SETREDRAW
| Sets the state of an internal flag that determines whether the control is
repainted when items are inserted and deleted, when the font is changed, and so on.
|
| WM_SIZE
| Recalculates the positions of tabs and may invalidate part of the tab control
to force repainting of some or all tabs.
|
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