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comparison: widget/windows/nsScreenManagerWin.cpp
widget/windows/nsScreenManagerWin.cpp
- branch
- TOR_BUG_9701
- changeset 10
- ac0c01689b40
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| -1:000000000000 | 0:bbcdc789ba3a |
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #include "nsScreenManagerWin.h" | |
| 7 #include "nsScreenWin.h" | |
| 8 #include "gfxWindowsPlatform.h" | |
| 9 #include "nsIWidget.h" | |
| 10 | |
| 11 | |
| 12 BOOL CALLBACK CountMonitors ( HMONITOR, HDC, LPRECT, LPARAM ioCount ) ; | |
| 13 | |
| 14 nsScreenManagerWin :: nsScreenManagerWin ( ) | |
| 15 : mNumberOfScreens(0) | |
| 16 { | |
| 17 // nothing to do. I guess we could cache a bunch of information | |
| 18 // here, but we want to ask the device at runtime in case anything | |
| 19 // has changed. | |
| 20 } | |
| 21 | |
| 22 | |
| 23 nsScreenManagerWin :: ~nsScreenManagerWin() | |
| 24 { | |
| 25 } | |
| 26 | |
| 27 | |
| 28 // addref, release, QI | |
| 29 NS_IMPL_ISUPPORTS(nsScreenManagerWin, nsIScreenManager) | |
| 30 | |
| 31 | |
| 32 // | |
| 33 // CreateNewScreenObject | |
| 34 // | |
| 35 // Utility routine. Creates a new screen object from the given device handle | |
| 36 // | |
| 37 // NOTE: For this "single-monitor" impl, we just always return the cached primary | |
| 38 // screen. This should change when a multi-monitor impl is done. | |
| 39 // | |
| 40 nsIScreen* | |
| 41 nsScreenManagerWin :: CreateNewScreenObject ( HMONITOR inScreen ) | |
| 42 { | |
| 43 nsIScreen* retScreen = nullptr; | |
| 44 | |
| 45 // look through our screen list, hoping to find it. If it's not there, | |
| 46 // add it and return the new one. | |
| 47 for ( unsigned i = 0; i < mScreenList.Length(); ++i ) { | |
| 48 ScreenListItem& curr = mScreenList[i]; | |
| 49 if ( inScreen == curr.mMon ) { | |
| 50 NS_IF_ADDREF(retScreen = curr.mScreen.get()); | |
| 51 return retScreen; | |
| 52 } | |
| 53 } // for each screen. | |
| 54 | |
| 55 retScreen = new nsScreenWin(inScreen); | |
| 56 mScreenList.AppendElement ( ScreenListItem ( inScreen, retScreen ) ); | |
| 57 | |
| 58 NS_IF_ADDREF(retScreen); | |
| 59 return retScreen; | |
| 60 } | |
| 61 | |
| 62 | |
| 63 // | |
| 64 // ScreenForRect | |
| 65 // | |
| 66 // Returns the screen that contains the rectangle. If the rect overlaps | |
| 67 // multiple screens, it picks the screen with the greatest area of intersection. | |
| 68 // | |
| 69 // The coordinates are in pixels (not twips) and in logical screen coordinates. | |
| 70 // | |
| 71 NS_IMETHODIMP | |
| 72 nsScreenManagerWin :: ScreenForRect ( int32_t inLeft, int32_t inTop, int32_t inWidth, int32_t inHeight, | |
| 73 nsIScreen **outScreen ) | |
| 74 { | |
| 75 if ( !(inWidth || inHeight) ) { | |
| 76 NS_WARNING ( "trying to find screen for sizeless window, using primary monitor" ); | |
| 77 *outScreen = CreateNewScreenObject ( nullptr ); // addrefs | |
| 78 return NS_OK; | |
| 79 } | |
| 80 | |
| 81 // convert coordinates from logical to device pixels for MonitorFromRect | |
| 82 double dpiScale = nsIWidget::DefaultScaleOverride(); | |
| 83 if (dpiScale <= 0.0) { | |
| 84 dpiScale = gfxWindowsPlatform::GetPlatform()->GetDPIScale(); | |
| 85 } | |
| 86 RECT globalWindowBounds = { | |
| 87 NSToIntRound(dpiScale * inLeft), | |
| 88 NSToIntRound(dpiScale * inTop), | |
| 89 NSToIntRound(dpiScale * (inLeft + inWidth)), | |
| 90 NSToIntRound(dpiScale * (inTop + inHeight)) | |
| 91 }; | |
| 92 | |
| 93 HMONITOR genScreen = ::MonitorFromRect( &globalWindowBounds, MONITOR_DEFAULTTOPRIMARY ); | |
| 94 | |
| 95 *outScreen = CreateNewScreenObject ( genScreen ); // addrefs | |
| 96 | |
| 97 return NS_OK; | |
| 98 | |
| 99 } // ScreenForRect | |
| 100 | |
| 101 | |
| 102 // | |
| 103 // GetPrimaryScreen | |
| 104 // | |
| 105 // The screen with the menubar/taskbar. This shouldn't be needed very | |
| 106 // often. | |
| 107 // | |
| 108 NS_IMETHODIMP | |
| 109 nsScreenManagerWin :: GetPrimaryScreen(nsIScreen** aPrimaryScreen) | |
| 110 { | |
| 111 *aPrimaryScreen = CreateNewScreenObject ( nullptr ); // addrefs | |
| 112 return NS_OK; | |
| 113 | |
| 114 } // GetPrimaryScreen | |
| 115 | |
| 116 | |
| 117 // | |
| 118 // CountMonitors | |
| 119 // | |
| 120 // Will be called once for every monitor in the system. Just | |
| 121 // increments the parameter, which holds a ptr to a PRUin32 holding the | |
| 122 // count up to this point. | |
| 123 // | |
| 124 BOOL CALLBACK | |
| 125 CountMonitors ( HMONITOR, HDC, LPRECT, LPARAM ioParam ) | |
| 126 { | |
| 127 uint32_t* countPtr = reinterpret_cast<uint32_t*>(ioParam); | |
| 128 ++(*countPtr); | |
| 129 | |
| 130 return TRUE; // continue the enumeration | |
| 131 | |
| 132 } // CountMonitors | |
| 133 | |
| 134 | |
| 135 // | |
| 136 // GetNumberOfScreens | |
| 137 // | |
| 138 // Returns how many physical screens are available. | |
| 139 // | |
| 140 NS_IMETHODIMP | |
| 141 nsScreenManagerWin :: GetNumberOfScreens(uint32_t *aNumberOfScreens) | |
| 142 { | |
| 143 if ( mNumberOfScreens ) | |
| 144 *aNumberOfScreens = mNumberOfScreens; | |
| 145 else { | |
| 146 uint32_t count = 0; | |
| 147 BOOL result = ::EnumDisplayMonitors(nullptr, nullptr, (MONITORENUMPROC)CountMonitors, (LPARAM)&count); | |
| 148 if (!result) | |
| 149 return NS_ERROR_FAILURE; | |
| 150 *aNumberOfScreens = mNumberOfScreens = count; | |
| 151 } | |
| 152 | |
| 153 return NS_OK; | |
| 154 | |
| 155 } // GetNumberOfScreens | |
| 156 | |
| 157 NS_IMETHODIMP | |
| 158 nsScreenManagerWin::GetSystemDefaultScale(float *aDefaultScale) | |
| 159 { | |
| 160 *aDefaultScale = float(gfxWindowsPlatform::GetPlatform()->GetDPIScale()); | |
| 161 return NS_OK; | |
| 162 } | |
| 163 | |
| 164 NS_IMETHODIMP | |
| 165 nsScreenManagerWin :: ScreenForNativeWidget(void *aWidget, nsIScreen **outScreen) | |
| 166 { | |
| 167 HMONITOR mon = MonitorFromWindow ((HWND) aWidget, MONITOR_DEFAULTTOPRIMARY); | |
| 168 *outScreen = CreateNewScreenObject (mon); | |
| 169 return NS_OK; | |
| 170 } |
