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twoaday |
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/* wptBalloonPop.cpp - Balloon Popup-Box |
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* Copyright (C) 2009 Timo Schulz |
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* |
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* This file is part of WinPT. |
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* |
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* WinPT is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License |
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* as published by the Free Software Foundation; either version 2 |
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* of the License, or (at your option) any later version. |
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* |
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* WinPT is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* General Public License for more details. |
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*/ |
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/* The idea is to use a balloon style 'error message' which |
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points to the control the error happened at. For instance |
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if no valid E-Mail address was entered, the balloon message |
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contains an error description with an arrow to the edit field |
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the address was supposed to be entered in. */ |
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#include <windows.h> |
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#include <stdio.h> |
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#include <time.h> |
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#include "wptTypes.h" |
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#define BT_WINDOWNAME "WinPT_BalloonPop" |
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#define BT_TIMER_IDENTIFIER 23 |
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#define BT_IOFFSET 8 |
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extern HINSTANCE glob_hinst; |
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struct balloon_ctx_s { |
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LPCTSTR text; |
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LPCTSTR icon_name; |
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POINT pos; |
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HWND hwnd; |
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}; |
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static struct balloon_ctx_s glob_msg; |
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static BOOL window_class_registered = FALSE; |
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static void |
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display_balloon_text (HWND hwnd, HDC hdc, const char *text) |
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{ |
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RECT rc; |
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memset (&rc, 0, sizeof (rc)); |
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GetClientRect(hwnd, &rc); |
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POINT pts[3]; |
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pts[0].x = rc.left + BT_IOFFSET; |
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pts[0].y = rc.top; |
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pts[1].x = pts[0].x; |
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pts[1].y = pts[0].y + BT_IOFFSET; |
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pts[2].x = pts[1].x + BT_IOFFSET; |
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pts[2].y = pts[1].y; |
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// we merge three regions here: |
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// 1) basis |
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// 2) rounded box |
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// 3) arrow |
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HRGN hrgn = CreateRectRgn(0, 0, 0, 0); |
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HRGN hrgn1 = CreateRoundRectRgn(rc.left, |
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rc.top + BT_IOFFSET, |
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rc.right, |
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rc.bottom, |
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15, 15); |
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HRGN hrgn2 = CreatePolygonRgn(&pts[0], 3, ALTERNATE); |
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CombineRgn(hrgn, hrgn1, hrgn2, RGN_OR); |
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// fill the region and draw a frame around it |
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FillRgn (hdc, hrgn, GetSysColorBrush(COLOR_INFOBK)); |
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FrameRgn (hdc, hrgn, (HBRUSH)GetStockObject (DKGRAY_BRUSH), 1, 1); |
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rc.top = rc.top + BT_IOFFSET*2; |
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rc.bottom = rc.bottom - BT_IOFFSET; |
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rc.left = rc.left + BT_IOFFSET; |
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rc.right = rc.right - BT_IOFFSET; |
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// FIXME: calculate best position |
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HICON hicon = LoadIcon (NULL, glob_msg.icon_name); |
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if (hicon != NULL) { |
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DrawIconEx (hdc, 5, 20, hicon, 28, 28, 0, NULL, DI_NORMAL); |
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DestroyIcon (hicon); |
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} |
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SetTextColor (hdc, GetSysColor (COLOR_INFOTEXT)); |
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DrawText (hdc, text, strlen (text), &rc, DT_VCENTER + DT_NOCLIP); |
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} |
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// window procedure for the balloon tip. |
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static LRESULT CALLBACK |
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window_proc (HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam) |
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{ |
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switch (msg) { |
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case WM_PAINT: |
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RECT rc; |
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GetWindowRect (hwnd, &rc); |
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POINT curpos; |
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curpos.x = glob_msg.pos.x; |
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curpos.y = glob_msg.pos.y; |
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rc.right = curpos.x - BT_IOFFSET + 6 + rc.right - rc.left; |
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rc.bottom = curpos.y + 20 + rc.bottom - rc.top; |
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rc.left = curpos.x - BT_IOFFSET + 6; |
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rc.top = curpos.y + 20; |
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MoveWindow (hwnd, rc.left, rc.top, rc.right - rc.left, |
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rc.bottom - rc.top, FALSE); |
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HDC hdc; |
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PAINTSTRUCT ps; |
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hdc = BeginPaint (hwnd, &ps); |
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LOGFONT lf; |
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memset (&lf, 0, sizeof (lf)); |
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lf.lfHeight = 13; |
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lf.lfWeight = FW_NORMAL; |
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lf.lfQuality = ANTIALIASED_QUALITY; |
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strcpy (lf.lfFaceName, "MS Sans Serif"); |
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HFONT hfont; |
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hfont = CreateFontIndirect(&lf); |
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HFONT hfont_old; |
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hfont_old = (HFONT)SelectObject(ps.hdc, hfont); |
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DrawText (ps.hdc, glob_msg.text, strlen (glob_msg.text), |
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&rc, DT_VCENTER+DT_NOCLIP+DT_CALCRECT); |
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rc.right = rc.right + 2*BT_IOFFSET; |
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rc.bottom = rc.bottom + 3*BT_IOFFSET; |
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ShowWindow (hwnd, SW_SHOWNA); |
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MoveWindow(hwnd, rc.left, rc.top, rc.right - rc.left, |
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rc.bottom - rc.top, TRUE); |
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SetBkMode(ps.hdc, TRANSPARENT); |
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display_balloon_text (hwnd, ps.hdc, glob_msg.text); |
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// restore old font object |
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SelectObject(ps.hdc, hfont_old); |
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DeleteObject (hfont); |
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EndPaint (hwnd, &ps); |
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break; |
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case WM_LBUTTONUP: |
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ShowWindow (hwnd, SW_HIDE); |
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break; |
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default: |
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return DefWindowProc (hwnd, msg, wparam, lparam); |
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} |
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return FALSE; |
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} |
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/* Callback procedure to hide the baloon window after the |
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time has been expired */ |
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static VOID CALLBACK |
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popup_timer_proc (HWND hwnd, UINT uMsg, UINT_PTR idEvent, DWORD dwTime) |
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{ |
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ShowWindow (hwnd, SW_HIDE); |
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} |
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/* Register our new window class */ |
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static void |
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register_window_class (HINSTANCE hinst) |
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{ |
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WNDCLASS wclass; |
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memset (&wclass, 0, sizeof (wclass)); |
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wclass.style = CS_HREDRAW | CS_VREDRAW; |
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wclass.lpfnWndProc = window_proc; |
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wclass.hInstance = hinst; |
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wclass.lpszClassName = BT_WINDOWNAME; |
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if (!RegisterClass (&wclass)) |
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abort (); |
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} |
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static LPCTSTR |
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format_text (LPCTSTR string) |
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{ |
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const int off = 12; |
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static char buf[2048]; |
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int n = strlen (string), pos=0, i; |
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memset (buf, 0, DIM (buf)); |
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// FIXME: rewrite the function |
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if (n > 1600) |
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abort (); |
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buf[pos++] = '\n'; |
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for (i=0; i < off; i++) |
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buf[pos++] = ' '; |
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for (i=0; i < n; i++) { |
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buf[pos++] = string[i]; |
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if (string[i] == '\n') { |
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for (int j=0; j < off; j++) |
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buf[pos++] = ' '; |
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} |
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} |
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buf[pos++] = '\n'; |
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return buf; |
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} |
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/* Display a baloon message box at the given X- Y-coordinates */ |
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HWND |
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show_balloon_msg_pos (HWND hparwnd, int millis, int x, int y, |
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LPCTSTR string, LPCTSTR icon_name) |
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{ |
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if (!window_class_registered) { |
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register_window_class (glob_hinst); |
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window_class_registered = TRUE; |
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} |
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// if no icon is requsted, print the text as it is. |
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if (!icon_name) |
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glob_msg.text = string; |
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else |
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glob_msg.text = format_text (string); |
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glob_msg.icon_name = icon_name; |
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if (x > 0 && y > 0) { // use specific coordinates |
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glob_msg.pos.x = x; |
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glob_msg.pos.y = y; |
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} |
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else { // point to the lower left region of the control |
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RECT rect; |
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GetWindowRect (hparwnd, &rect); |
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glob_msg.pos.x = rect.left; |
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glob_msg.pos.y = rect.bottom - 20; |
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} |
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// we use a persistent window for the balloon messages |
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// instead of destroy/create we hide the window whenever it |
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// is unused. |
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if (!glob_msg.hwnd) { |
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glob_msg.hwnd = CreateWindowEx (WS_EX_TOOLWINDOW | WS_EX_TOPMOST, |
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BT_WINDOWNAME, BT_WINDOWNAME, |
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WS_POPUP, 1, 1, 1, 1, |
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NULL, NULL, glob_hinst, NULL); |
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if (!glob_msg.hwnd) |
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BUG (0); |
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} |
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// ensure 'parent' never loses focus. |
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HWND hwnd = glob_msg.hwnd; |
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ShowWindow (hwnd, SW_SHOW); |
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UpdateWindow (hwnd); |
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EnableWindow (hparwnd, TRUE); |
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SetActiveWindow (NULL); |
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// show message for a fixed amount of time |
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SetTimer (hwnd, BT_TIMER_IDENTIFIER, millis, popup_timer_proc); |
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return hwnd; |
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} |
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/* Show message at the default position for 5 seconds */ |
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void |
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show_balloon_msg (HWND hparwnd, LPCTSTR string, LPCTSTR icon_name) |
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{ |
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show_balloon_msg_pos (hparwnd, 5000, 0, 0, string ,icon_name); |
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} |
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/* Disable the message box (hide the window) */ |
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void |
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balloon_msg_disable (void) |
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{ |
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ShowWindow (glob_msg.hwnd, SW_HIDE); |
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} |
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