decorations.java

源码为Eclipse开源开发平台桌面开发工具SWT的源代码,

		if (((state & HIDDEN) == 0) == visible) return;
	} else {
		if (visible == OS.IsWindowVisible (handle)) return;
	}
	if (visible) {
		/*
		* It is possible (but unlikely), that application
		* code could have disposed the widget in the show
		* event.  If this happens, just return.
		*/
		sendEvent (SWT.Show);
		if (isDisposed ()) return;
		if (OS.IsHPC) {
			if (menuBar != null) {
				int hwndCB = menuBar.hwndCB;
				OS.CommandBar_DrawMenuBar (hwndCB, 0);
			}
		}
		if (drawCount != 0) {
			state &= ~HIDDEN;
		} else {
			if (OS.IsWinCE) {
				OS.ShowWindow (handle, OS.SW_SHOW);
			} else {
				if (menuBar != null) {
					display.removeBar (menuBar);
					OS.DrawMenuBar (handle);
				}
				OS.ShowWindow (handle, swFlags);
			}
			OS.UpdateWindow (handle);
		}
	} else {
		if (!OS.IsWinCE) {
			if (OS.IsIconic (handle)) {
				swFlags = OS.SW_SHOWMINNOACTIVE;
			} else {
				if (OS.IsZoomed (handle)) {
					swFlags = OS.SW_SHOWMAXIMIZED;
				} else {
					if (handle == OS.GetActiveWindow ()) {
						swFlags = OS.SW_RESTORE;
					} else {
						swFlags = OS.SW_SHOWNOACTIVATE;
					}
				}
			}
		}
		if (drawCount != 0) {
			state |= HIDDEN;
		} else {
			OS.ShowWindow (handle, OS.SW_HIDE);
		}
		/*
		* It is possible (but unlikely), that application
		* code could have disposed the widget in an event
		* triggered by ShowWindow().  If this happens, just
		* return.
		*/
		if (isDisposed ()) return;
		sendEvent (SWT.Hide);
	}
}

boolean translateAccelerator (MSG msg) {
	if (!isEnabled () || !isActive ()) return false;
	if (menuBar != null && !menuBar.isEnabled ()) return false;
	if (translateMDIAccelerator (msg) || translateMenuAccelerator (msg)) return true;
	Decorations decorations = parent.menuShell ();
	return decorations.translateAccelerator (msg);
}

boolean translateMenuAccelerator (MSG msg) {
	if (hAccel == -1) createAccelerators ();
	return hAccel != 0 && OS.TranslateAccelerator (handle, hAccel, msg) != 0;
}

boolean translateMDIAccelerator (MSG msg) {
	if (!(this instanceof Shell)) {
		Shell shell = getShell ();
		int hwndMDIClient = shell.hwndMDIClient;
		if (hwndMDIClient != 0 && OS.TranslateMDISysAccel (hwndMDIClient, msg)) {
			return true;
		}
		if (msg.message == OS.WM_KEYDOWN) {
			if (OS.GetKeyState (OS.VK_CONTROL) >= 0) return false;
			switch (msg.wParam) {
				case OS.VK_F4:
					OS.PostMessage (handle, OS.WM_CLOSE, 0, 0);
					return true;
				case OS.VK_F6:
					if (traverseDecorations (true)) return true;
			}
			return false;
		}
		if (msg.message == OS.WM_SYSKEYDOWN) {
			switch (msg.wParam) {
				case OS.VK_F4:
					OS.PostMessage (shell.handle, OS.WM_CLOSE, 0, 0);
					return true;
			}
			return false;
		}
	}
	return false;
}

boolean traverseDecorations (boolean next) {
	Control [] children = parent._getChildren ();
	int length = children.length;
	int index = 0;
	while (index < length) {
		if (children [index] == this) break;
		index++;
	}
	/*
	* It is possible (but unlikely), that application
	* code could have disposed the widget in focus in
	* or out events.  Ensure that a disposed widget is
	* not accessed.
	*/
	int start = index, offset = (next) ? 1 : -1;
	while ((index = (index + offset + length) % length) != start) {
		Control child = children [index];
		if (!child.isDisposed () && child instanceof Decorations) {
			if (child.setFocus ()) return true;
		}
	}
	return false;
}

boolean traverseItem (boolean next) {
	return false;
}

boolean traverseReturn () {
	if (defaultButton == null || defaultButton.isDisposed ()) return false;
	if (!defaultButton.isVisible () || !defaultButton.isEnabled ()) return false;
	defaultButton.click ();
	return true;
}

CREATESTRUCT widgetCreateStruct () {
	return new CREATESTRUCT ();
}

int widgetExtStyle () {
	int bits = super.widgetExtStyle () | OS.WS_EX_MDICHILD;
	bits &= ~OS.WS_EX_CLIENTEDGE;
	if ((style & SWT.NO_TRIM) != 0) return bits;
	if (OS.IsPPC) {
		if ((style & SWT.CLOSE) != 0) bits |= OS.WS_EX_CAPTIONOKBTN;
	}
	if ((style & SWT.TOOL) != 0) bits |= OS.WS_EX_TOOLWINDOW;
	if ((style & SWT.RESIZE) != 0) return bits;
	if ((style & SWT.BORDER) != 0) bits |= OS.WS_EX_DLGMODALFRAME;
	return bits;
}

int widgetParent () {
	Shell shell = getShell ();
	return shell.hwndMDIClient ();
}

int widgetStyle () {
	/* 
	* Clear WS_VISIBLE and WS_TABSTOP.  NOTE: In Windows, WS_TABSTOP
	* has the same value as WS_MAXIMIZEBOX so these bits cannot be
	* used to control tabbing.
	*/
	int bits = super.widgetStyle () & ~(OS.WS_TABSTOP | OS.WS_VISIBLE);
	
	/* Set the title bits and no-trim bits */
	bits &= ~OS.WS_BORDER;
	if ((style & SWT.NO_TRIM) != 0) return bits;
	if ((style & SWT.TITLE) != 0) bits |= OS.WS_CAPTION;
	
	/* Set the min and max button bits */
	if ((style & SWT.MIN) != 0) bits |= OS.WS_MINIMIZEBOX;
	if ((style & SWT.MAX) != 0) bits |= OS.WS_MAXIMIZEBOX;
	
	/* Set the resize, dialog border or border bits */
	if ((style & SWT.RESIZE) != 0) {
		/*
		* Note on WinCE PPC.  SWT.RESIZE is used to resize
		* the Shell according to the state of the IME.
		* It does not set the WS_THICKFRAME style.
		*/
		if (!OS.IsPPC) bits |= OS.WS_THICKFRAME;	
	} else {
		if ((style & SWT.BORDER) == 0) bits |= OS.WS_BORDER;
	}

	/* Set the system menu and close box bits */
	if (!OS.IsPPC && !OS.IsSP) {
		if ((style & SWT.CLOSE) != 0) bits |= OS.WS_SYSMENU;
	}
	
	return bits;
}

int windowProc (int hwnd, int msg, int wParam, int lParam) {
	switch (msg) {
		case Display.SWT_GETACCEL:
		case Display.SWT_GETACCELCOUNT:
			if (hAccel == -1) createAccelerators ();
			return msg == Display.SWT_GETACCELCOUNT ? nAccel : hAccel;
	}
	return super.windowProc (hwnd, msg, wParam, lParam);
}

LRESULT WM_ACTIVATE (int wParam, int lParam) {
	LRESULT result = super.WM_ACTIVATE (wParam, lParam);
	if (result != null) return result;
	if ((wParam & 0xFFFF) != 0) {
		/*
		* When the high word of wParam is non-zero, the activation
		* state of the window is being changed while the window is
		* minimized. If this is the case, do not report activation
		* events or restore the focus.
		*/
		if ((wParam >> 16) != 0) return result;
		/*
		* It is possible (but unlikely), that application
		* code could have disposed the widget in the activate
		* event.  If this happens, end the processing of the
		* Windows message by returning zero as the result of
		* the window proc.
		*/
		Control control = display.findControl (lParam);
		if (control == null || control instanceof Shell) {
			if (this instanceof Shell) {
				sendEvent (SWT.Activate);
				if (isDisposed ()) return LRESULT.ZERO;
			}
		}
		if (restoreFocus ()) return LRESULT.ZERO;	
	} else {
		/*
		* It is possible (but unlikely), that application
		* code could have disposed the widget in the deactivate
		* event.  If this happens, end the processing of the
		* Windows message by returning zero as the result of
		* the window proc.
		*/
		Control control = display.findControl (lParam);
		if (control == null || control instanceof Shell) {
			if (this instanceof Shell) {
				Shell shell = getShell ();
				shell.setActiveControl (null);
				if (isDisposed ()) return LRESULT.ZERO;
				sendEvent (SWT.Deactivate);
				if (isDisposed ()) return LRESULT.ZERO;
			}
		}
		saveFocus ();
	}
	return result;
}

LRESULT WM_CLOSE (int wParam, int lParam) {
	LRESULT result = super.WM_CLOSE (wParam, lParam);
	if (result != null) return result;
	if (!isEnabled () || !isActive ()) return LRESULT.ZERO;
	Event event = new Event ();
	sendEvent (SWT.Close, event);
	// the widget could be disposed at this point
	if (event.doit && !isDisposed ()) dispose ();
	return LRESULT.ZERO;
}

LRESULT WM_HOTKEY (int wParam, int lParam) {
	LRESULT result = super.WM_HOTKEY (wParam, lParam);
	if (result != null) return result;
	if (OS.IsSP) {
		/*
		* Feature on WinCE SP.  The Back key is either used to close
		* the foreground Dialog or used as a regular Back key in an EDIT
		* control. The article 'Back Key' in MSDN for Smartphone 
		* describes how an application should handle it.  The 
		* workaround is to override the Back key when creating
		* the menubar and handle it based on the style of the Shell.
		* If the Shell has the SWT.CLOSE style, close the Shell.
		* Otherwise, send the Back key to the window with focus.
		*/
		if (((lParam >> 16) & 0xFFFF) == OS.VK_ESCAPE) {
			if ((style & SWT.CLOSE) != 0) {
				OS.PostMessage (handle, OS.WM_CLOSE, 0, 0);
			} else {
				OS.SHSendBackToFocusWindow (OS.WM_HOTKEY, wParam, lParam);
			}
			return LRESULT.ZERO;
		}
	}
	return result;
}

LRESULT WM_KILLFOCUS (int wParam, int lParam) {
	LRESULT result  = super.WM_KILLFOCUS (wParam, lParam);
	saveFocus ();
	return result;
}

LRESULT WM_NCACTIVATE (int wParam, int lParam) {
	LRESULT result = super.WM_NCACTIVATE (wParam, lParam);
	if (result != null) return result;
	if (wParam == 0) {
		if (display.lockActiveWindow) return LRESULT.ZERO;
		Control control = display.findControl (lParam);
		if (control != null) {
			Shell shell = getShell ();
			Decorations decorations = control.menuShell ();
			if (decorations.getShell () == shell) {
				if (this instanceof Shell) return LRESULT.ONE;
				if (display.ignoreRestoreFocus) {
					if (display.lastHittest != OS.HTCLIENT) {
						result = LRESULT.ONE;
					}
				}
			}
		}
	}
	if (!(this instanceof Shell)) {
		int hwndShell = getShell().handle;
		OS.SendMessage (hwndShell, OS.WM_NCACTIVATE, wParam, lParam);
	}
	return result;
}

LRESULT WM_QUERYOPEN (int wParam, int lParam) {
	LRESULT result = super.WM_QUERYOPEN (wParam, lParam);
	if (result != null) return result;
	sendEvent (SWT.Deiconify);
	// widget could be disposed at this point
	return result;
}

LRESULT WM_SETFOCUS (int wParam, int lParam) {
	LRESULT result = super.WM_SETFOCUS (wParam, lParam);
	if (savedFocus != this) restoreFocus ();
	return result;
}

LRESULT WM_SIZE (int wParam, int lParam) {
	LRESULT result = super.WM_SIZE (wParam, lParam);
	/*
	* It is possible (but unlikely), that application
	* code could have disposed the widget in the resize
	* event.  If this happens, end the processing of the
	* Windows message by returning the result of the
	* WM_SIZE message.
	*/
	if (isDisposed ()) return result;
	if (wParam == OS.SIZE_MINIMIZED) {
		sendEvent (SWT.Iconify);
		// widget could be disposed at this point
	}
	return result;
}

LRESULT WM_SYSCOMMAND (int wParam, int lParam) {
	LRESULT result = super.WM_SYSCOMMAND (wParam,lParam);
	if (result != null) return result;
	if (!(this instanceof Shell)) {
		int cmd = wParam & 0xFFF0;
		switch (cmd) {
			case OS.SC_CLOSE: {
				OS.PostMessage (handle, OS.WM_CLOSE, 0, 0);
				return LRESULT.ZERO;
			}
			case OS.SC_NEXTWINDOW: {
				traverseDecorations (true);
				return LRESULT.ZERO;
			}
		}
	}
	return result;
}

LRESULT WM_WINDOWPOSCHANGING (int wParam, int lParam) {
	LRESULT result = super.WM_WINDOWPOSCHANGING (wParam,lParam);
	if (result != null) return result;
	if (display.lockActiveWindow) {
		WINDOWPOS lpwp = new WINDOWPOS ();
		OS.MoveMemory (lpwp, lParam, WINDOWPOS.sizeof);
		lpwp.flags |= OS.SWP_NOZORDER;
		OS.MoveMemory (lParam, lpwp, WINDOWPOS.sizeof);
	}
	return result;
}

}