1 | /**************************************************************************** |
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2 | ** |
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3 | ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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4 | ** |
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5 | ** Use, modification and distribution is allowed without limitation, |
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6 | ** warranty, liability or support of any kind. |
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7 | ** |
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8 | ****************************************************************************/ |
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9 | |
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10 | #include "qtwin.h" |
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11 | #include <QLibrary> |
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12 | #include <QApplication> |
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13 | #include <QWidget> |
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14 | #include <QList> |
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15 | #include <QPointer> |
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16 | |
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17 | #ifdef Q_WS_X11 |
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18 | #include <QX11Info> |
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19 | #endif // Q_WS_X11 |
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20 | |
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21 | #ifdef Q_WS_WIN |
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22 | |
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23 | #include <qt_windows.h> |
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24 | |
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25 | // Blur behind data structures |
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26 | #define DWM_BB_ENABLE 0x00000001 // fEnable has been specified |
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27 | #define DWM_BB_BLURREGION 0x00000002 // hRgnBlur has been specified |
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28 | #define DWM_BB_TRANSITIONONMAXIMIZED 0x00000004 // fTransitionOnMaximized has been specified |
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29 | #define WM_DWMCOMPOSITIONCHANGED 0x031E // Composition changed window message |
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30 | |
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31 | typedef struct _DWM_BLURBEHIND |
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32 | { |
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33 | DWORD dwFlags; |
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34 | BOOL fEnable; |
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35 | HRGN hRgnBlur; |
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36 | BOOL fTransitionOnMaximized; |
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37 | } DWM_BLURBEHIND, *PDWM_BLURBEHIND; |
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38 | |
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39 | typedef struct _MARGINS |
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40 | { |
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41 | int cxLeftWidth; |
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42 | int cxRightWidth; |
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43 | int cyTopHeight; |
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44 | int cyBottomHeight; |
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45 | } MARGINS, *PMARGINS; |
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46 | |
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47 | typedef HRESULT (WINAPI *PtrDwmIsCompositionEnabled)(BOOL* pfEnabled); |
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48 | typedef HRESULT (WINAPI *PtrDwmExtendFrameIntoClientArea)(HWND hWnd, const MARGINS* pMarInset); |
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49 | typedef HRESULT (WINAPI *PtrDwmEnableBlurBehindWindow)(HWND hWnd, const DWM_BLURBEHIND* pBlurBehind); |
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50 | typedef HRESULT (WINAPI *PtrDwmGetColorizationColor)(DWORD *pcrColorization, BOOL *pfOpaqueBlend); |
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51 | |
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52 | static PtrDwmIsCompositionEnabled pDwmIsCompositionEnabled= 0; |
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53 | static PtrDwmEnableBlurBehindWindow pDwmEnableBlurBehindWindow = 0; |
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54 | static PtrDwmExtendFrameIntoClientArea pDwmExtendFrameIntoClientArea = 0; |
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55 | static PtrDwmGetColorizationColor pDwmGetColorizationColor = 0; |
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56 | |
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57 | |
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58 | /* |
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59 | * Internal helper class that notifies windows if the |
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60 | * DWM compositing state changes and updates the widget |
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61 | * flags correspondingly. |
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62 | */ |
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63 | class WindowNotifier : public QWidget |
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64 | { |
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65 | public: |
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66 | WindowNotifier() { winId(); } |
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67 | void addWidget(QWidget *widget) { widgets.append(widget); } |
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68 | void removeWidget(QWidget *widget) { widgets.removeAll(widget); } |
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69 | bool winEvent(MSG *message, long *result); |
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70 | |
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71 | private: |
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72 | QWidgetList widgets; |
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73 | }; |
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74 | |
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75 | static bool resolveLibs() |
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76 | { |
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77 | if (!pDwmIsCompositionEnabled) { |
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78 | QLibrary dwmLib(QString::fromAscii("dwmapi")); |
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79 | pDwmIsCompositionEnabled =(PtrDwmIsCompositionEnabled)dwmLib.resolve("DwmIsCompositionEnabled"); |
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80 | pDwmExtendFrameIntoClientArea = (PtrDwmExtendFrameIntoClientArea)dwmLib.resolve("DwmExtendFrameIntoClientArea"); |
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81 | pDwmEnableBlurBehindWindow = (PtrDwmEnableBlurBehindWindow)dwmLib.resolve("DwmEnableBlurBehindWindow"); |
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82 | pDwmGetColorizationColor = (PtrDwmGetColorizationColor)dwmLib.resolve("DwmGetColorizationColor"); |
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83 | } |
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84 | return pDwmIsCompositionEnabled != 0; |
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85 | } |
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86 | |
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87 | #endif |
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88 | |
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89 | /*! |
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90 | * Chekcs and returns true if Windows DWM composition |
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91 | * is currently enabled on the system. |
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92 | * |
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93 | * To get live notification on the availability of |
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94 | * this feature, you will currently have to |
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95 | * reimplement winEvent() on your widget and listen |
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96 | * for the WM_DWMCOMPOSITIONCHANGED event to occur. |
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97 | * |
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98 | */ |
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99 | bool QtWin::isCompositionEnabled() |
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100 | { |
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101 | #ifdef Q_WS_WIN |
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102 | if (resolveLibs()) { |
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103 | HRESULT hr = S_OK; |
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104 | BOOL isEnabled = false; |
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105 | hr = pDwmIsCompositionEnabled(&isEnabled); |
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106 | if (SUCCEEDED(hr)) |
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107 | return isEnabled; |
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108 | } |
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109 | return false; |
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110 | #elif defined(Q_WS_X11) |
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111 | return QX11Info::isCompositingManagerRunning(); |
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112 | #else |
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113 | //! \todo TODO: Check for trsnsparency support in other OSes. |
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114 | return false; |
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115 | #endif |
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116 | } |
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117 | |
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118 | /*! |
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119 | * Enables Blur behind on a Widget. |
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120 | * |
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121 | * \a enable tells if the blur should be enabled or not |
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122 | */ |
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123 | bool QtWin::enableBlurBehindWindow(QWidget *widget, bool enable) |
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124 | { |
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125 | Q_ASSERT(widget); |
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126 | Q_UNUSED(widget); |
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127 | Q_UNUSED(enable); |
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128 | bool result = false; |
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129 | #ifdef Q_WS_WIN |
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130 | if (resolveLibs()) { |
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131 | DWM_BLURBEHIND bb = {0}; |
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132 | HRESULT hr = S_OK; |
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133 | bb.fEnable = enable; |
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134 | bb.dwFlags = DWM_BB_ENABLE; |
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135 | bb.hRgnBlur = NULL; |
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136 | #endif |
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137 | widget->setAttribute(Qt::WA_TranslucentBackground, enable); |
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138 | widget->setAttribute(Qt::WA_NoSystemBackground, enable); |
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139 | #ifdef Q_WS_WIN |
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140 | hr = pDwmEnableBlurBehindWindow(widget->winId(), &bb); |
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141 | if (SUCCEEDED(hr)) { |
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142 | result = true; |
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143 | windowNotifier()->addWidget(widget); |
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144 | } |
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145 | } |
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146 | #endif |
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147 | return result; |
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148 | } |
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149 | |
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150 | /*! |
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151 | * ExtendFrameIntoClientArea. |
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152 | * |
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153 | * This controls the rendering of the frame inside the window. |
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154 | * Note that passing margins of -1 (the default value) will completely |
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155 | * remove the frame from the window. |
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156 | * |
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157 | * \note you should not call enableBlurBehindWindow before calling |
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158 | * this functions |
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159 | * |
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160 | * \a enable tells if the blur should be enabled or not |
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161 | */ |
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162 | bool QtWin::extendFrameIntoClientArea(QWidget *widget, int left, int top, int right, int bottom) |
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163 | { |
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164 | |
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165 | Q_ASSERT(widget); |
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166 | Q_UNUSED(widget); |
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167 | Q_UNUSED(left); |
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168 | Q_UNUSED(top); |
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169 | Q_UNUSED(right); |
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170 | Q_UNUSED(bottom); |
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171 | |
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172 | bool result = false; |
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173 | #ifdef Q_WS_WIN |
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174 | if (resolveLibs()) { |
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175 | QLibrary dwmLib(QString::fromAscii("dwmapi")); |
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176 | HRESULT hr = S_OK; |
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177 | MARGINS m = {left, top, right, bottom}; |
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178 | hr = pDwmExtendFrameIntoClientArea(widget->winId(), &m); |
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179 | if (SUCCEEDED(hr)) { |
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180 | result = true; |
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181 | windowNotifier()->addWidget(widget); |
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182 | } |
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183 | widget->setAttribute(Qt::WA_TranslucentBackground, result); |
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184 | } |
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185 | #endif |
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186 | return result; |
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187 | } |
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188 | |
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189 | /*! |
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190 | * Returns the current colorizationColor for the window. |
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191 | * |
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192 | * \a enable tells if the blur should be enabled or not |
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193 | */ |
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194 | QColor QtWin::colorizatinColor() |
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195 | { |
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196 | QColor resultColor = QApplication::palette().window().color(); |
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197 | |
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198 | #ifdef Q_WS_WIN |
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199 | if (resolveLibs()) { |
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200 | DWORD color = 0; |
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201 | BOOL opaque = FALSE; |
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202 | QLibrary dwmLib(QString::fromAscii("dwmapi")); |
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203 | HRESULT hr = S_OK; |
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204 | hr = pDwmGetColorizationColor(&color, &opaque); |
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205 | if (SUCCEEDED(hr)) |
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206 | resultColor = QColor(color); |
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207 | } |
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208 | #endif |
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209 | return resultColor; |
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210 | } |
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211 | |
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212 | #ifdef Q_WS_WIN |
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213 | WindowNotifier *QtWin::windowNotifier() |
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214 | { |
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215 | static WindowNotifier *windowNotifierInstance = 0; |
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216 | if (!windowNotifierInstance) |
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217 | windowNotifierInstance = new WindowNotifier; |
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218 | return windowNotifierInstance; |
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219 | } |
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220 | |
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221 | |
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222 | /* Notify all enabled windows that the DWM state changed */ |
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223 | bool WindowNotifier::winEvent(MSG *message, long *result) |
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224 | { |
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225 | if (message && message->message == WM_DWMCOMPOSITIONCHANGED) { |
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226 | bool compositionEnabled = QtWin::isCompositionEnabled(); |
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227 | foreach(QWidget * widget, widgets) { |
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228 | if (widget) { |
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229 | widget->setAttribute(Qt::WA_NoSystemBackground, compositionEnabled); |
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230 | } |
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231 | widget->update(); |
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232 | } |
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233 | } |
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234 | return QWidget::winEvent(message, result); |
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235 | } |
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236 | #endif |
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