gtkappbar.c

Linux下的多协议即时通讯程序源代码

/*
 * purple - WinPurple Options Plugin
 *
 * File: gtkappbar.c
 * Date: August 2, 2003
 * Description: Appbar functionality for Windows GTK+ applications
 *
 * Copyright (C) 2003, Herman Bloggs <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */
/*
 *  TODO:
 *  - Move 'App on top' feature from Trans plugin to here
 *  - Bug: Multiple Show/Hide Desktop calls causes client area to disappear
 */
#include <windows.h>
#include <winver.h>
#include <stdio.h>
#include <gtk/gtk.h>
#include <gdk/gdkwin32.h>
#include "gtkappbar.h"
#include "debug.h"

#define APPBAR_CALLBACK 	WM_USER + 1010

typedef HMONITOR WINAPI purple_MonitorFromPoint(POINT, DWORD);
typedef HMONITOR WINAPI purple_MonitorFromWindow(HWND, DWORD);
typedef BOOL WINAPI purple_GetMonitorInfo(HMONITOR, LPMONITORINFO);

/* Retrieve the rectangular display area from the specified monitor
 * Return TRUE if successful, otherwise FALSE
 */
static gboolean
get_rect_from_monitor(HMODULE hmod, HMONITOR monitor, RECT *rect) {
	purple_GetMonitorInfo *the_GetMonitorInfo;
	MONITORINFO info;

	if (!(the_GetMonitorInfo = (purple_GetMonitorInfo*)
		GetProcAddress(hmod, "GetMonitorInfoA"))) {
		return FALSE;
	}

	info.cbSize = sizeof(info);
	if (!the_GetMonitorInfo(monitor, &info)) {
		return FALSE;
	}

	CopyRect(rect, &(info.rcMonitor));

	return TRUE;
}

/**
 * This will only work on Win98+ and Win2K+
 * Return TRUE if successful, otherwise FALSE
 */
static gboolean
get_rect_at_point_multimonitor(POINT pt, RECT *rect) {
	HMODULE hmod;
	purple_MonitorFromPoint *the_MonitorFromPoint;
	HMONITOR monitor;

	if (!(hmod = GetModuleHandle("user32"))) {
		return FALSE;
	}

	if (!(the_MonitorFromPoint = (purple_MonitorFromPoint*)
		GetProcAddress(hmod, "MonitorFromPoint"))) {
		return FALSE;
	}

	monitor =
		the_MonitorFromPoint(pt, MONITOR_DEFAULTTOPRIMARY);

	return get_rect_from_monitor(hmod, monitor, rect);
}

/**
 * This will only work on Win98+ and Win2K+
 * Return TRUE if successful, otherwise FALSE
 */
static gboolean
get_rect_of_window_multimonitor(HWND window, RECT *rect) {
	HMODULE hmod;
	purple_MonitorFromWindow *the_MonitorFromWindow;
	HMONITOR monitor;

	if (!(hmod = GetModuleHandle("user32"))) {
		return FALSE;
	}

	if (!(the_MonitorFromWindow = (purple_MonitorFromWindow*)
		GetProcAddress(hmod, "MonitorFromWindow"))) {
		return FALSE;
	}

	monitor =
		the_MonitorFromWindow(window, MONITOR_DEFAULTTOPRIMARY);

	return get_rect_from_monitor(hmod, monitor, rect);
}

/*
 * Fallback if cannot get the RECT from the monitor directly
 */
static void get_default_workarea(RECT *rect) {
	if (!SystemParametersInfo(SPI_GETWORKAREA, 0, &rect, FALSE)) {
		/* I don't think this will ever happen */
		rect->left = 0;
		rect->top = 0;
		rect->bottom = GetSystemMetrics(SM_CYSCREEN);
		rect->right = GetSystemMetrics(SM_CXSCREEN);
	}
}

/* Retrieve the rectangle of the active work area at a point */
static void get_rect_at_point(POINT pt, RECT *rc) {
	if (!get_rect_at_point_multimonitor(pt, rc)) {
		get_default_workarea(rc);
	}
}

/* Retrieve the rectangle of the active work area of a window*/
static void get_rect_of_window(HWND window, RECT *rc) {
	if (!get_rect_of_window_multimonitor(window, rc)) {
		get_default_workarea(rc);
	}
}

static void get_window_normal_rc(HWND hwnd, RECT *rc) {
         WINDOWPLACEMENT wplc;
         GetWindowPlacement(hwnd, &wplc);
         CopyRect(rc, &wplc.rcNormalPosition);
}
#if 0
static void print_rect(RECT *rc) {
        purple_debug(PURPLE_DEBUG_INFO, "gtkappbar", "RECT: L:%ld R:%ld T:%ld B:%ld\n",
                   rc->left, rc->right, rc->top, rc->bottom);
}
#endif
/** Set the window style to be the "Tool Window" style - small header, no min/max buttons */
static void set_toolbar(HWND hwnd, gboolean val) {
	LONG style=0;

        style = GetWindowLong(hwnd, GWL_EXSTYLE);
        if(val && !(style & WS_EX_TOOLWINDOW))
                style |= WS_EX_TOOLWINDOW;
        else if(!val && style & WS_EX_TOOLWINDOW)
                style &= ~WS_EX_TOOLWINDOW;
        else
                return;
        SetWindowLong(hwnd, GWL_EXSTYLE, style);
	SetWindowPos(hwnd, 0, 0, 0, 0, 0,
		SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE);
	
/*	This really should be the following, but SWP_FRAMECHANGED strangely causes initermittent problems "Show Desktop" done more than once.
 *	Not having SWP_FRAMECHANGED *should* cause the Style not to be applied, but i haven't noticed any problems
 *			SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER | SWP_FRAMECHANGED);
 */
}
/** Register the window as an appbar */
static gboolean gtk_appbar_register(GtkAppBar *ab, HWND hwnd) {
	APPBARDATA abd;

	abd.cbSize = sizeof(APPBARDATA);
	abd.hWnd = hwnd;
	abd.uCallbackMessage = APPBAR_CALLBACK;

	ab->registered = SHAppBarMessage(ABM_NEW, &abd);

	return ab->registered;
}
/** Unregister the window as an appbar */
static gboolean gtk_appbar_unregister(GtkAppBar *ab, HWND hwnd) {
	APPBARDATA abd;

        if(!ab->registered)
                return TRUE;

	abd.cbSize = sizeof(APPBARDATA);
	abd.hWnd = hwnd;

	SHAppBarMessage(ABM_REMOVE, &abd); /** This always returns TRUE */

	ab->registered = FALSE;

	ab->docked = FALSE;
	ab->docking = FALSE;

	return TRUE;
}

static void gtk_appbar_querypos(GtkAppBar *ab, HWND hwnd, RECT rcWorkspace) {
	APPBARDATA abd;
	guint iWidth = 0;

	if(!ab->registered)
		gtk_appbar_register(ab, hwnd);

	abd.hWnd = hwnd;
	abd.cbSize = sizeof(APPBARDATA);
	abd.uEdge = ab->side;

	iWidth = ab->docked_rect.right - ab->docked_rect.left;

	abd.rc.top = rcWorkspace.top;
	abd.rc.bottom = rcWorkspace.bottom;
	switch (abd.uEdge)
	{
		case ABE_LEFT:
			abd.rc.left = rcWorkspace.left;
			abd.rc.right = rcWorkspace.left + iWidth;
			break;

		case ABE_RIGHT:
			abd.rc.right = rcWorkspace.right;
			abd.rc.left = rcWorkspace.right - iWidth;
			break;
	}

        /* Ask the system for the screen space */
	SHAppBarMessage(ABM_QUERYPOS, &abd);

	switch (abd.uEdge)
	{
		case ABE_LEFT:
                        abd.rc.right = abd.rc.left + iWidth;
			break;

		case ABE_RIGHT:
			abd.rc.left = abd.rc.right - iWidth;
			break;
	}

	CopyRect(&(ab->docked_rect), &abd.rc);
}
/* Actually set the size and screen location of the appbar */
static void gtk_appbar_setpos(GtkAppBar *ab, HWND hwnd) {
        APPBARDATA abd;

        if(!ab->registered)
                gtk_appbar_register(ab, hwnd);

	abd.hWnd = hwnd;
	abd.cbSize = sizeof(APPBARDATA);
        CopyRect(&abd.rc, &(ab->docked_rect));
	abd.uEdge = ab->side;

	SHAppBarMessage(ABM_SETPOS, &abd);
}
/** Let any callbacks know that we have docked or undocked */
static void gtk_appbar_dispatch_dock_cbs(GtkAppBar *ab, gboolean val) {
        GList *lst = ab->dock_cbs;

        while(lst) {
                GtkAppBarDockCB dock_cb = lst->data;
                dock_cb(val);
                lst = lst->next;
        }
}

static GdkFilterReturn wnd_moving(GtkAppBar *ab, GdkXEvent *xevent) {
        MSG *msg = (MSG*)xevent;
        POINT cp;
        RECT *rc = (RECT*)msg->lParam;
	RECT monRect;
        int side = -1;
	long dockAreaWidth = 0;

        purple_debug(PURPLE_DEBUG_INFO, "gtkappbar", "wnd_moving\n");

        GetCursorPos(&cp);
	get_rect_at_point(cp, &monRect);

	dockAreaWidth = (monRect.right - monRect.left) / 10;
        /* Which part of the screen are we in ? */
	if (cp.x > (monRect.right - dockAreaWidth)) {
                side = ABE_RIGHT;
	} else if (cp.x < (monRect.left + dockAreaWidth)) {
                side = ABE_LEFT;
	}

        if(!ab->docked) {
                if( (side == ABE_RIGHT || side == ABE_LEFT) ) {
                        if( !ab->docking ) {
                                ab->side = side;
                                GetWindowRect(msg->hwnd, &(ab->docked_rect));
				gtk_appbar_querypos(ab, msg->hwnd, monRect);

                                /* save pre-docking height */
                                ab->undocked_height = rc->bottom - rc->top;
                                ab->docking = TRUE;
                        }
                }
                else
                        ab->docking = FALSE;
        }
        else if(side < 0) {
                gtk_appbar_unregister(ab, msg->hwnd);
                rc->bottom = rc->top + ab->undocked_height;
        }

        /* Switch to toolbar/regular caption*/
        if(ab->docking)
                set_toolbar(msg->hwnd, TRUE);
        else if(!ab->docked)
                set_toolbar(msg->hwnd, FALSE);