DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (31ec81b5d7bb)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsScreenManagerWin.h"
#include "nsScreenWin.h"
#include "gfxWindowsPlatform.h"
#include "nsIWidget.h"


BOOL CALLBACK CountMonitors ( HMONITOR, HDC, LPRECT, LPARAM ioCount ) ;

nsScreenManagerWin :: nsScreenManagerWin ( )
  : mNumberOfScreens(0)
{
  // nothing to do. I guess we could cache a bunch of information
  // here, but we want to ask the device at runtime in case anything
  // has changed.
}


nsScreenManagerWin :: ~nsScreenManagerWin()
{
}


// addref, release, QI
NS_IMPL_ISUPPORTS1(nsScreenManagerWin, nsIScreenManager)


//
// CreateNewScreenObject
//
// Utility routine. Creates a new screen object from the given device handle
//
// NOTE: For this "single-monitor" impl, we just always return the cached primary
//        screen. This should change when a multi-monitor impl is done.
//
nsIScreen* 
nsScreenManagerWin :: CreateNewScreenObject ( HMONITOR inScreen )
{
  nsIScreen* retScreen = nullptr;
  
  // look through our screen list, hoping to find it. If it's not there,
  // add it and return the new one.
  for ( unsigned i = 0; i < mScreenList.Length(); ++i ) {
    ScreenListItem& curr = mScreenList[i];
    if ( inScreen == curr.mMon ) {
      NS_IF_ADDREF(retScreen = curr.mScreen.get());
      return retScreen;
    }
  } // for each screen.
 
  retScreen = new nsScreenWin(inScreen);
  mScreenList.AppendElement ( ScreenListItem ( inScreen, retScreen ) );

  NS_IF_ADDREF(retScreen);
  return retScreen;
}


//
// ScreenForRect 
//
// Returns the screen that contains the rectangle. If the rect overlaps
// multiple screens, it picks the screen with the greatest area of intersection.
//
// The coordinates are in pixels (not twips) and in logical screen coordinates.
//
NS_IMETHODIMP
nsScreenManagerWin :: ScreenForRect ( int32_t inLeft, int32_t inTop, int32_t inWidth, int32_t inHeight,
                                        nsIScreen **outScreen )
{
  if ( !(inWidth || inHeight) ) {
    NS_WARNING ( "trying to find screen for sizeless window, using primary monitor" );
    *outScreen = CreateNewScreenObject ( nullptr );    // addrefs
    return NS_OK;
  }

  // convert coordinates from logical to device pixels for MonitorFromRect
  double dpiScale = nsIWidget::DefaultScaleOverride();
  if (dpiScale <= 0.0) {
    dpiScale = gfxWindowsPlatform::GetPlatform()->GetDPIScale(); 
  }
  RECT globalWindowBounds = {
    NSToIntRound(dpiScale * inLeft),
    NSToIntRound(dpiScale * inTop),
    NSToIntRound(dpiScale * (inLeft + inWidth)),
    NSToIntRound(dpiScale * (inTop + inHeight))
  };

  HMONITOR genScreen = ::MonitorFromRect( &globalWindowBounds, MONITOR_DEFAULTTOPRIMARY );

  *outScreen = CreateNewScreenObject ( genScreen );    // addrefs
  
  return NS_OK;
    
} // ScreenForRect


//
// GetPrimaryScreen
//
// The screen with the menubar/taskbar. This shouldn't be needed very
// often.
//
NS_IMETHODIMP 
nsScreenManagerWin :: GetPrimaryScreen(nsIScreen** aPrimaryScreen) 
{
  *aPrimaryScreen = CreateNewScreenObject ( nullptr );    // addrefs  
  return NS_OK;
  
} // GetPrimaryScreen


//
// CountMonitors
//
// Will be called once for every monitor in the system. Just 
// increments the parameter, which holds a ptr to a PRUin32 holding the
// count up to this point.
//
BOOL CALLBACK
CountMonitors ( HMONITOR, HDC, LPRECT, LPARAM ioParam )
{
  uint32_t* countPtr = reinterpret_cast<uint32_t*>(ioParam);
  ++(*countPtr);

  return TRUE; // continue the enumeration

} // CountMonitors


//
// GetNumberOfScreens
//
// Returns how many physical screens are available.
//
NS_IMETHODIMP
nsScreenManagerWin :: GetNumberOfScreens(uint32_t *aNumberOfScreens)
{
  if ( mNumberOfScreens )
    *aNumberOfScreens = mNumberOfScreens;
  else {
    uint32_t count = 0;
    BOOL result = ::EnumDisplayMonitors(nullptr, nullptr, (MONITORENUMPROC)CountMonitors, (LPARAM)&count);
    if (!result)
      return NS_ERROR_FAILURE;
    *aNumberOfScreens = mNumberOfScreens = count;
  }

  return NS_OK;
  
} // GetNumberOfScreens

NS_IMETHODIMP
nsScreenManagerWin::GetSystemDefaultScale(float *aDefaultScale)
{
  *aDefaultScale = float(gfxWindowsPlatform::GetPlatform()->GetDPIScale());
  return NS_OK;
}

NS_IMETHODIMP
nsScreenManagerWin :: ScreenForNativeWidget(void *aWidget, nsIScreen **outScreen)
{
  HMONITOR mon = MonitorFromWindow ((HWND) aWidget, MONITOR_DEFAULTTOPRIMARY);
  *outScreen = CreateNewScreenObject (mon);
  return NS_OK;
}