dlls/comctl32/theme_button.c

   1 /*
   2  * Theming - Button control
   3  *
   4  * Copyright (c) 2008 by Reece H. Dunn
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  *
  20  */
  21
  22 #include <stdarg.h>
  23 #include <string.h>
  24 #include <stdlib.h>
  25
  26 #include "windef.h"
  27 #include "winbase.h"
  28 #include "wingdi.h"
  29 #include "winuser.h"
  30 #include "uxtheme.h"
  31 #include "tmschema.h"
  32 #include "comctl32.h"
  33
  34 #define BUTTON_TYPE 0x0f /* bit mask for the available button types */
  35
  36 /* These are indices into a states array to determine the theme state for a given theme part. */
  37 typedef enum
  38 {
  39         STATE_NORMAL,
  40         STATE_DISABLED,
  41         STATE_HOT,
  42         STATE_PRESSED,
  43         STATE_DEFAULTED
  44 } ButtonState;
  45
  46 typedef void (*pfThemedPaint)(HTHEME theme, HWND hwnd, HDC hdc, ButtonState drawState, UINT dtFlags);
  47
  48 static UINT get_drawtext_flags(DWORD style, DWORD ex_style)
  49 {
  50     UINT flags = 0;
  51
  52     if (style & BS_PUSHLIKE)
  53         style &= ~BUTTON_TYPE;
  54
  55     if (!(style & BS_MULTILINE))
  56         flags |= DT_SINGLELINE;
  57     else
  58         flags |= DT_WORDBREAK;
  59
  60     switch (style & BS_CENTER)
  61     {
  62     case BS_LEFT:   flags |= DT_LEFT;   break;
  63     case BS_RIGHT:  flags |= DT_RIGHT;  break;
  64     case BS_CENTER: flags |= DT_CENTER; break;
  65     default:
  66         flags |= ((style & BUTTON_TYPE) <= BS_DEFPUSHBUTTON)
  67                ? DT_CENTER : DT_LEFT;
  68     }
  69
  70     if (ex_style & WS_EX_RIGHT)
  71         flags = DT_RIGHT | (flags & ~(DT_LEFT | DT_CENTER));
  72
  73     if ((style & BUTTON_TYPE) != BS_GROUPBOX)
  74     {
  75         switch (style & BS_VCENTER)
  76         {
  77         case BS_TOP:     flags |= DT_TOP;     break;
  78         case BS_BOTTOM:  flags |= DT_BOTTOM;  break;
  79         case BS_VCENTER: /* fall through */
  80         default:         flags |= DT_VCENTER; break;
  81         }
  82     }
  83     else
  84         /* GroupBox's text is always single line and is top aligned. */
  85         flags |= DT_SINGLELINE | DT_TOP;
  86
  87     return flags;
  88 }
  89
  90 static inline WCHAR *get_button_text(HWND hwnd)
  91 {
  92     INT len = 512;
  93     WCHAR *text;
  94     text = HeapAlloc(GetProcessHeap(), 0, (len + 1) * sizeof(WCHAR));
  95     if (text) InternalGetWindowText(hwnd, text, len + 1);
  96     return text;
  97 }
  98
  99 static void PB_draw(HTHEME theme, HWND hwnd, HDC hDC, ButtonState drawState, UINT dtFlags)
 100 {
 101     static const int states[] = { PBS_NORMAL, PBS_DISABLED, PBS_HOT, PBS_PRESSED, PBS_DEFAULTED };
 102
 103     RECT bgRect, textRect;
 104     HFONT font = (HFONT)SendMessageW(hwnd, WM_GETFONT, 0, 0);
 105     HFONT hPrevFont = font ? SelectObject(hDC, font) : NULL;
 106     int state = states[ drawState ];
 107     WCHAR *text = get_button_text(hwnd);
 108
 109     GetClientRect(hwnd, &bgRect);
 110     GetThemeBackgroundContentRect(theme, hDC, BP_PUSHBUTTON, state, &bgRect, &textRect);
 111
 112     if (IsThemeBackgroundPartiallyTransparent(theme, BP_PUSHBUTTON, state))
 113         DrawThemeParentBackground(hwnd, hDC, NULL);
 114     DrawThemeBackground(theme, hDC, BP_PUSHBUTTON, state, &bgRect, NULL);
 115     if (text)
 116     {
 117         DrawThemeText(theme, hDC, BP_PUSHBUTTON, state, text, lstrlenW(text), dtFlags, 0, &textRect);
 118         HeapFree(GetProcessHeap(), 0, text);
 119     }
 120
 121     if (hPrevFont) SelectObject(hDC, hPrevFont);
 122 }
 123
 124 static void CB_draw(HTHEME theme, HWND hwnd, HDC hDC, ButtonState drawState, UINT dtFlags)
 125 {
 126     static const int cb_states[3][5] =
 127     {
 128         { CBS_UNCHECKEDNORMAL, CBS_UNCHECKEDDISABLED, CBS_UNCHECKEDHOT, CBS_UNCHECKEDPRESSED, CBS_UNCHECKEDNORMAL },
 129         { CBS_CHECKEDNORMAL, CBS_CHECKEDDISABLED, CBS_CHECKEDHOT, CBS_CHECKEDPRESSED, CBS_CHECKEDNORMAL },
 130         { CBS_MIXEDNORMAL, CBS_MIXEDDISABLED, CBS_MIXEDHOT, CBS_MIXEDPRESSED, CBS_MIXEDNORMAL }
 131     };
 132
 133     static const int rb_states[2][5] =
 134     {
 135         { RBS_UNCHECKEDNORMAL, RBS_UNCHECKEDDISABLED, RBS_UNCHECKEDHOT, RBS_UNCHECKEDPRESSED, RBS_UNCHECKEDNORMAL },
 136         { RBS_CHECKEDNORMAL, RBS_CHECKEDDISABLED, RBS_CHECKEDHOT, RBS_CHECKEDPRESSED, RBS_CHECKEDNORMAL }
 137     };
 138
 139     static const int cb_size = 13;
 140
 141     RECT bgRect, textRect;
 142     HFONT font = (HFONT)SendMessageW(hwnd, WM_GETFONT, 0, 0);
 143     HFONT hPrevFont = font ? SelectObject(hDC, font) : NULL;
 144     LRESULT checkState = SendMessageW(hwnd, BM_GETCHECK, 0, 0);
 145     DWORD dwStyle = GetWindowLongW(hwnd, GWL_STYLE);
 146     int part = ((dwStyle & BUTTON_TYPE) == BS_RADIOBUTTON) || ((dwStyle & BUTTON_TYPE) == BS_AUTORADIOBUTTON)
 147              ? BP_RADIOBUTTON
 148              : BP_CHECKBOX;
 149     int state = (part == BP_CHECKBOX)
 150               ? cb_states[ checkState ][ drawState ]
 151               : rb_states[ checkState ][ drawState ];
 152     WCHAR *text = get_button_text(hwnd);
 153
 154     GetClientRect(hwnd, &bgRect);
 155     GetThemeBackgroundContentRect(theme, hDC, part, state, &bgRect, &textRect);
 156
 157     if (dtFlags & DT_SINGLELINE) /* Center the checkbox / radio button to the text. */
 158         bgRect.top = bgRect.top + (textRect.bottom - textRect.top - cb_size) / 2;
 159
 160     /* adjust for the check/radio marker */
 161     bgRect.bottom = bgRect.top + cb_size;
 162     bgRect.right = bgRect.left + cb_size;
 163     textRect.left = bgRect.right + 6;
 164
 165     if (IsThemeBackgroundPartiallyTransparent(theme, part, state))
 166         DrawThemeParentBackground(hwnd, hDC, NULL);
 167     DrawThemeBackground(theme, hDC, part, state, &bgRect, NULL);
 168     if (text)
 169     {
 170         DrawThemeText(theme, hDC, part, state, text, lstrlenW(text), dtFlags, 0, &textRect);
 171         HeapFree(GetProcessHeap(), 0, text);
 172     }
 173
 174     if (hPrevFont) SelectObject(hDC, hPrevFont);
 175 }
 176
 177 static void GB_draw(HTHEME theme, HWND hwnd, HDC hDC, ButtonState drawState, UINT dtFlags)
 178 {
 179     static const int states[] = { GBS_NORMAL, GBS_DISABLED, GBS_NORMAL, GBS_NORMAL, GBS_NORMAL };
 180
 181     RECT bgRect, textRect, contentRect;
 182     HFONT font = (HFONT)SendMessageW(hwnd, WM_GETFONT, 0, 0);
 183     HFONT hPrevFont = font ? SelectObject(hDC, font) : NULL;
 184     int state = states[ drawState ];
 185     WCHAR *text = get_button_text(hwnd);
 186
 187     GetClientRect(hwnd, &bgRect);
 188     textRect = bgRect;
 189
 190     if (text)
 191     {
 192         SIZE textExtent;
 193         GetTextExtentPoint32W(hDC, text, lstrlenW(text), &textExtent);
 194         bgRect.top += (textExtent.cy / 2);
 195         textRect.left += 10;
 196         textRect.bottom = textRect.top + textExtent.cy;
 197         textRect.right = textRect.left + textExtent.cx + 4;
 198
 199         ExcludeClipRect(hDC, textRect.left, textRect.top, textRect.right, textRect.bottom);
 200     }
 201
 202     GetThemeBackgroundContentRect(theme, hDC, BP_GROUPBOX, state, &bgRect, &contentRect);
 203     ExcludeClipRect(hDC, contentRect.left, contentRect.top, contentRect.right, contentRect.bottom);
 204
 205     if (IsThemeBackgroundPartiallyTransparent(theme, BP_GROUPBOX, state))
 206         DrawThemeParentBackground(hwnd, hDC, NULL);
 207     DrawThemeBackground(theme, hDC, BP_GROUPBOX, state, &bgRect, NULL);
 208
 209     SelectClipRgn(hDC, NULL);
 210
 211     if (text)
 212     {
 213         textRect.left += 2;
 214         textRect.right -= 2;
 215         DrawThemeText(theme, hDC, BP_GROUPBOX, state, text, lstrlenW(text), 0, 0, &textRect);
 216         HeapFree(GetProcessHeap(), 0, text);
 217     }
 218
 219     if (hPrevFont) SelectObject(hDC, hPrevFont);
 220 }
 221
 222 static const pfThemedPaint btnThemedPaintFunc[BUTTON_TYPE + 1] =
 223 {
 224     PB_draw, /* BS_PUSHBUTTON */
 225     PB_draw, /* BS_DEFPUSHBUTTON */
 226     CB_draw, /* BS_CHECKBOX */
 227     CB_draw, /* BS_AUTOCHECKBOX */
 228     CB_draw, /* BS_RADIOBUTTON */
 229     CB_draw, /* BS_3STATE */
 230     CB_draw, /* BS_AUTO3STATE */
 231     GB_draw, /* BS_GROUPBOX */
 232     NULL, /* BS_USERBUTTON */
 233     CB_draw, /* BS_AUTORADIOBUTTON */
 234     NULL, /* Not defined */
 235     NULL, /* BS_OWNERDRAW */
 236     NULL, /* Not defined */
 237     NULL, /* Not defined */
 238     NULL, /* Not defined */
 239     NULL, /* Not defined */
 240 };
 241
 242 static BOOL BUTTON_Paint(HTHEME theme, HWND hwnd, HDC hParamDC)
 243 {
 244     PAINTSTRUCT ps;
 245     HDC hDC;
 246     DWORD dwStyle = GetWindowLongW(hwnd, GWL_STYLE);
 247     DWORD dwStyleEx = GetWindowLongW(hwnd, GWL_EXSTYLE);
 248     UINT dtFlags = get_drawtext_flags(dwStyle, dwStyleEx);
 249     ButtonState drawState = IsWindowEnabled(hwnd) ? STATE_NORMAL : STATE_DISABLED;
 250     pfThemedPaint paint = btnThemedPaintFunc[ dwStyle & BUTTON_TYPE ];
 251
 252     if (paint)
 253     {
 254         hDC = hParamDC ? hParamDC : BeginPaint(hwnd, &ps);
 255         paint(theme, hwnd, hDC, drawState, dtFlags);
 256         if (!hParamDC) EndPaint(hwnd, &ps);
 257         return TRUE;
 258     }
 259
 260     return FALSE; /* Delegate drawing to the non-themed code. */
 261 }
 262
 263 /**********************************************************************
 264  * The button control subclass window proc.
 265  */
 266 LRESULT CALLBACK THEMING_ButtonSubclassProc(HWND hwnd, UINT msg,
 267                                             WPARAM wParam, LPARAM lParam,
 268                                             ULONG_PTR dwRefData)
 269 {
 270     const WCHAR* themeClass = WC_BUTTONW;
 271     HTHEME theme;
 272     LRESULT result;
 273
 274     switch (msg)
 275     {
 276     case WM_CREATE:
 277         result = THEMING_CallOriginalClass(hwnd, msg, wParam, lParam);
 278         OpenThemeData(hwnd, themeClass);
 279         return result;
 280
 281     case WM_DESTROY:
 282         theme = GetWindowTheme(hwnd);
 283         CloseThemeData (theme);
 284         return THEMING_CallOriginalClass(hwnd, msg, wParam, lParam);
 285
 286     case WM_THEMECHANGED:
 287         theme = GetWindowTheme(hwnd);
 288         CloseThemeData (theme);
 289         OpenThemeData(hwnd, themeClass);
 290         break;
 291
 292     case WM_SYSCOLORCHANGE:
 293         theme = GetWindowTheme(hwnd);
 294         if (!theme) return THEMING_CallOriginalClass(hwnd, msg, wParam, lParam);
 295         /* Do nothing. When themed, a WM_THEMECHANGED will be received, too,
 296          * which will do the repaint. */
 297         break;
 298
 299     case WM_PAINT:
 300         theme = GetWindowTheme(hwnd);
 301         if (theme && BUTTON_Paint(theme, hwnd, (HDC)wParam))
 302             return 0;
 303         else
 304             return THEMING_CallOriginalClass(hwnd, msg, wParam, lParam);
 305
 306     case WM_ENABLE:
 307         theme = GetWindowTheme(hwnd);
 308         if (theme) RedrawWindow(hwnd, NULL, NULL,
 309                                 RDW_FRAME | RDW_INVALIDATE | RDW_UPDATENOW);
 310         return THEMING_CallOriginalClass(hwnd, msg, wParam, lParam);
 311
 312     default:
 313         /* Call old proc */
 314         return THEMING_CallOriginalClass(hwnd, msg, wParam, lParam);
 315     }
 316     return 0;
 317 }