control.java

源码为Eclipse开源开发平台桌面开发工具SWT的源代码,

Control computeTabRoot () {
	Control [] tabList = parent._getTabList ();
	if (tabList != null) {
		int index = 0;
		while (index < tabList.length) {
			if (tabList [index] == this) break;
			index++;
		}
		if (index == tabList.length) {
			if (isTabGroup ()) return this;
		}
	}
	return parent.computeTabRoot ();
}

Control [] computeTabList () {
	if (isTabGroup ()) {
		if (getVisible () && getEnabled ()) {
			return new Control [] {this};
		}
	}
	return new Control [0];
}

void createHandle () {
	int hwndParent = widgetParent ();
	handle = OS.CreateWindowEx (
		widgetExtStyle (),
		windowClass (),
		null,
		widgetStyle (),
		OS.CW_USEDEFAULT, 0, OS.CW_USEDEFAULT, 0,
		hwndParent,
		0,
		OS.GetModuleHandle (null),
		widgetCreateStruct ());
	if (handle == 0) error (SWT.ERROR_NO_HANDLES);
	int bits = OS.GetWindowLong (handle, OS.GWL_STYLE);
	if ((bits & OS.WS_CHILD) != 0) {
		OS.SetWindowLong (handle, OS.GWL_ID, handle);
	}
	if (OS.IsDBLocale && hwndParent != 0) {
		int hIMC = OS.ImmGetContext (hwndParent);
		OS.ImmAssociateContext (handle, hIMC);
		OS.ImmReleaseContext (hwndParent, hIMC);
	}
}

void createWidget () {
	foreground = background = -1;
	checkOrientation (parent);
	createHandle ();
	register ();
	subclass ();
	setDefaultFont ();
	checkMirrored ();
}

int defaultBackground () {
	if (OS.IsWinCE) return OS.GetSysColor (OS.COLOR_WINDOW);
	return OS.GetSysColor (OS.COLOR_BTNFACE);
}

int defaultFont () {
	return display.systemFont ();
}

int defaultForeground () {
	return OS.GetSysColor (OS.COLOR_WINDOWTEXT);
}

void deregister () {
	display.removeControl (handle);
}

void destroyWidget () {
	int hwnd = handle;
	releaseHandle ();
	if (hwnd != 0) {
		OS.DestroyWindow (hwnd);
	}
}

void drawBackground (int hDC) {
	RECT rect = new RECT ();
	OS.GetClientRect (handle, rect);
	drawBackground (hDC, rect);
}

void drawBackground (int hDC, RECT rect) {
	int hPalette = display.hPalette;
	if (hPalette != 0) {
		OS.SelectPalette (hDC, hPalette, false);
		OS.RealizePalette (hDC);
	}
	int pixel = getBackgroundPixel ();
	int hBrush = findBrush (pixel);
	OS.FillRect (hDC, rect, hBrush);
}

void enableWidget (boolean enabled) {
	OS.EnableWindow (handle, enabled);
}

int findBrush (int pixel) {
	return parent.findBrush (pixel);
}

Cursor findCursor () {
	if (cursor != null) return cursor;
	return parent.findCursor ();
}

Menu [] findMenus (Control control) {
	if (menu != null && this != control) return new Menu [] {menu};
	return new Menu [0];
}

char findMnemonic (String string) {
	int index = 0;
	int length = string.length ();
	do {
		while (index < length && string.charAt (index) != '&') index++;
		if (++index >= length) return '\0';
		if (string.charAt (index) != '&') return string.charAt (index);
		index++;
	} while (index < length);
 	return '\0';
}

void fixChildren (Shell newShell, Shell oldShell, Decorations newDecorations, Decorations oldDecorations, Menu [] menus) {
	oldShell.fixShell (newShell, this);
	oldDecorations.fixDecorations (newDecorations, this, menus);
}

void fixFocus (Control focusControl) {
	Shell shell = getShell ();
	Control control = this;
	while ((control = control.parent) != null) {
		if (control.setFocus ()) return;
		if (control == shell) break;
	}
	shell.setSavedFocus (focusControl);
	OS.SetFocus (0);
}

/**
 * Forces the receiver to have the <em>keyboard focus</em>, causing
 * all keyboard events to be delivered to it.
 *
 * @return <code>true</code> if the control got focus, and <code>false</code> if it was unable to.
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @see #setFocus
 */
public boolean forceFocus () {
	checkWidget ();
	Decorations shell = menuShell ();
	shell.setSavedFocus (this);
	if (!isEnabled () || !isVisible () || !isActive ()) return false;
	if (isFocusControl ()) return true;
	shell.setSavedFocus (null);
	/*
	* This code is intentionally commented.
	*
	* When setting focus to a control, it is
	* possible that application code can set
	* the focus to another control inside of
	* WM_SETFOCUS.  In this case, the original
	* control will no longer have the focus
	* and the call to setFocus() will return
	* false indicating failure.
	* 
	* We are still working on a solution at
	* this time.
	*/
//	if (OS.GetFocus () != OS.SetFocus (handle)) return false;
	OS.SetFocus (handle);
	if (isDisposed ()) return false;
	shell.setSavedFocus (this);
	return isFocusControl ();
}

void forceResize () {
	if (parent == null) return;
	WINDOWPOS [] lpwp = parent.lpwp;
	if (lpwp == null) return;
	for (int i=0; i<lpwp.length; i++) {
		WINDOWPOS wp = lpwp [i];
		if (wp != null && wp.hwnd == handle) {
			/*
			* This code is intentionally commented.  All widgets that
			* are created by SWT have WS_CLIPSIBLINGS to ensure that
			* application code does not draw outside of the control.
			*/	
//			int count = parent.getChildrenCount ();
//			if (count > 1) {
//				int bits = OS.GetWindowLong (handle, OS.GWL_STYLE);
//				if ((bits & OS.WS_CLIPSIBLINGS) == 0) wp.flags |= OS.SWP_NOCOPYBITS;
//			}
			SetWindowPos (wp.hwnd, 0, wp.x, wp.y, wp.cx, wp.cy, wp.flags);
			lpwp [i] = null;
			return;
		}	
	}
}

/**
 * Returns the accessible object for the receiver.
 * If this is the first time this object is requested,
 * then the object is created and returned.
 *
 * @return the accessible object
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 * 
 * @see Accessible#addAccessibleListener
 * @see Accessible#addAccessibleControlListener
 * 
 * @since 2.0
 */
public Accessible getAccessible () {
	checkWidget ();
	if (accessible == null) accessible = new_Accessible (this);
	return accessible;
}

/**
 * Returns the receiver's background color.
 *
 * @return the background color
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public Color getBackground () {
	checkWidget ();
	return Color.win32_new (display, getBackgroundPixel ());
}

int getBackgroundPixel () {
	if (background == -1) return defaultBackground ();
	return background;
}

/**
 * Returns the receiver's border width.
 *
 * @return the border width
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public int getBorderWidth () {
	checkWidget ();
	int bits1 = OS.GetWindowLong (handle, OS.GWL_EXSTYLE);
	if ((bits1 & OS.WS_EX_CLIENTEDGE) != 0) return OS.GetSystemMetrics (OS.SM_CXEDGE);
	if ((bits1 & OS.WS_EX_STATICEDGE) != 0) return OS.GetSystemMetrics (OS.SM_CXBORDER);
	int bits2 = OS.GetWindowLong (handle, OS.GWL_STYLE);
	if ((bits2 & OS.WS_BORDER) != 0) return OS.GetSystemMetrics (OS.SM_CXBORDER);
	return 0;
}

/**
 * Returns a rectangle describing the receiver's size and location
 * relative to its parent (or its display if its parent is null),
 * unless the receiver is a shell. In this case, the location is
 * relative to the display.
 *
 * @return the receiver's bounding rectangle
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public Rectangle getBounds () {
	checkWidget ();
	forceResize ();
	RECT rect = new RECT ();
	OS.GetWindowRect (handle, rect);
	int hwndParent = parent == null ? 0 : parent.handle;
	OS.MapWindowPoints (0, hwndParent, rect, 2);
	int width = rect.right - rect.left;
	int height =  rect.bottom - rect.top;
	return new Rectangle (rect.left, rect.top, width, height);
}

int getCodePage () {
	if (OS.IsUnicode) return OS.CP_ACP;
	int hFont = OS.SendMessage (handle, OS.WM_GETFONT, 0, 0);
	LOGFONT logFont = OS.IsUnicode ? (LOGFONT) new LOGFONTW () : new LOGFONTA ();
	OS.GetObject (hFont, LOGFONT.sizeof, logFont);
	int cs = logFont.lfCharSet & 0xFF;
	int [] lpCs = new int [8];
	if (OS.TranslateCharsetInfo (cs, lpCs, OS.TCI_SRCCHARSET)) {
		return lpCs [1];
	}
	return OS.GetACP ();
}

/**
 * Returns <code>true</code> if the receiver is enabled, and
 * <code>false</code> otherwise. A disabled control is typically
 * not selectable from the user interface and draws with an
 * inactive or "grayed" look.
 *
 * @return the receiver's enabled state
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 * 
 * @see #isEnabled
 */
public boolean getEnabled () {
	checkWidget ();
	return OS.IsWindowEnabled (handle);
}

/**
 * Returns the font that the receiver will use to paint textual information.
 *
 * @return the receiver's font
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public Font getFont () {
	checkWidget ();	
	int hFont = OS.SendMessage (handle, OS.WM_GETFONT, 0, 0);
	if (hFont == 0) hFont = defaultFont ();
	return Font.win32_new (display, hFont);
}

/**
 * Returns the foreground color that the receiver will use to draw.
 *
 * @return the receiver's foreground color
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public Color getForeground () {
	checkWidget ();
	return Color.win32_new (display, getForegroundPixel ());
}

int getForegroundPixel () {
	if (foreground == -1) return defaultForeground ();
	return foreground;
}

/**
 * Returns layout data which is associated with the receiver.
 *
 * @return the receiver's layout data
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public Object getLayoutData () {
	checkWidget ();
	return layoutData;
}

/**
 * Returns a point describing the receiver's location relative
 * to its parent (or its display if its parent is null), unless
 * the receiver is a shell. In this case, the point is 
 * relative to the display. 
 *
 * @return the receiver's location
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public Point getLocation () {
	checkWidget ();
	forceResize ();
	RECT rect = new RECT ();
	OS.GetWindowRect (handle, rect);
	int hwndParent = parent == null ? 0 : parent.handle;
	OS.MapWindowPoints (0, hwndParent, rect, 2);
	return new Point (rect.left, rect.top);
}

/**
 * Returns the receiver's pop up menu if it has one, or null
 * if it does not. All controls may optionally have a pop up
 * menu that is displayed when the user requests one for
 * the control. The sequence of key strokes, button presses
 * and/or button releases that are used to request a pop up
 * menu is platform specific.
 *
 * @return the receiver's menu
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public Menu getMenu () {