Esempio n. 1
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 static extern bool GetMonitorInfo(IntPtr hMonitor, MONITORINFO lpmi);
Esempio n. 2
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        /// <summary>
        /// Get the min/max window size for this window
        /// Correctly accounting for the task bar size and position
        /// </summary>
        /// <param name="hwnd"></param>
        /// <param name="lParam"></param>
        private void WmGetMinMaxInfo(System.IntPtr hwnd, System.IntPtr lParam)
        {
            // Get the point position to determine what screen we are on
            GetCursorPos(out var lMousePosition);

            // Now get the current screen
            var lCurrentScreen = mBeingMoved ?
                                 // If being dragged get it from the mouse position
                                 MonitorFromPoint(lMousePosition, MonitorOptions.MONITOR_DEFAULTTONULL) :
                                 // Otherwise get it from the window position (for example being moved via Win + Arrow)
                                 // in case the mouse is on another monitor
                                 MonitorFromWindow(hwnd, MonitorOptions.MONITOR_DEFAULTTONULL);

            var lPrimaryScreen = MonitorFromPoint(new POINT(0, 0), MonitorOptions.MONITOR_DEFAULTTOPRIMARY);

            // Try and get the current screen information
            var lCurrentScreenInfo = new MONITORINFO();

            if (GetMonitorInfo(lCurrentScreen, lCurrentScreenInfo) == false)
            {
                return;
            }

            // Try and get the primary screen information
            var lPrimaryScreenInfo = new MONITORINFO();

            if (GetMonitorInfo(lPrimaryScreen, lPrimaryScreenInfo) == false)
            {
                return;
            }

            // NOTE: Always update it
            // If this has changed from the last one, update the transform
            //if (lCurrentScreen != mLastScreen || mMonitorDpi == null)
            mMonitorDpi = VisualTreeHelper.GetDpi(mWindow);

            // Store last know screen
            mLastScreen = lCurrentScreen;

            // Get work area sizes and rations
            var currentX      = lCurrentScreenInfo.RCWork.Left - lCurrentScreenInfo.RCMonitor.Left;
            var currentY      = lCurrentScreenInfo.RCWork.Top - lCurrentScreenInfo.RCMonitor.Top;
            var currentWidth  = (lCurrentScreenInfo.RCWork.Right - lCurrentScreenInfo.RCWork.Left);
            var currentHeight = (lCurrentScreenInfo.RCWork.Bottom - lCurrentScreenInfo.RCWork.Top);
            var currentRatio  = (float)currentWidth / (float)currentHeight;

            var primaryX      = lPrimaryScreenInfo.RCWork.Left - lPrimaryScreenInfo.RCMonitor.Left;
            var primaryY      = lPrimaryScreenInfo.RCWork.Top - lPrimaryScreenInfo.RCMonitor.Top;
            var primaryWidth  = (lPrimaryScreenInfo.RCWork.Right - lPrimaryScreenInfo.RCWork.Left);
            var primaryHeight = (lPrimaryScreenInfo.RCWork.Bottom - lPrimaryScreenInfo.RCWork.Top);
            var primaryRatio  = (float)primaryWidth / (float)primaryHeight;

            if (lParam != IntPtr.Zero)
            {
                // Get min/max structure to fill with information
                var lMmi = (MINMAXINFO)Marshal.PtrToStructure(lParam, typeof(MINMAXINFO));

                //
                //   NOTE: The below setting of max sizes we no longer do
                //         as through observations, it appears Windows works
                //         correctly only when the max window size is set to
                //         EXACTLY the size of the primary window
                //
                //         Anything else and the behavior is wrong and the max
                //         window width on a secondary monitor if larger than the
                //         primary then goes too large
                //
                //          lMmi.PointMaxPosition.X = 0;
                //          lMmi.PointMaxPosition.Y = 0;
                //          lMmi.PointMaxSize.X = lCurrentScreenInfo.RCMonitor.Right - lCurrentScreenInfo.RCMonitor.Left;
                //          lMmi.PointMaxSize.Y = lCurrentScreenInfo.RCMonitor.Bottom - lCurrentScreenInfo.RCMonitor.Top;
                //
                //         Instead we now just add a margin to the window itself
                //         to compensate when maximized
                //
                //
                // NOTE: rcMonitor is the monitor size
                //       rcWork is the available screen size (so the area inside the task bar start menu for example)

                // Size limits (used by Windows when maximized)
                // relative to 0,0 being the current screens top-left corner

                // Set to primary monitor size
                lMmi.PointMaxPosition.X = lPrimaryScreenInfo.RCMonitor.Left;
                lMmi.PointMaxPosition.Y = lPrimaryScreenInfo.RCMonitor.Top;
                lMmi.PointMaxSize.X     = lPrimaryScreenInfo.RCMonitor.Right;
                lMmi.PointMaxSize.Y     = lPrimaryScreenInfo.RCMonitor.Bottom;

                // Set min size
                var minSize = new Point(mWindow.MinWidth * mMonitorDpi.Value.DpiScaleX, mWindow.MinHeight * mMonitorDpi.Value.DpiScaleX);
                lMmi.PointMinTrackSize.X = (int)minSize.X;
                lMmi.PointMinTrackSize.Y = (int)minSize.Y;

                // Now we have the max size, allow the host to tweak as needed
                Marshal.StructureToPtr(lMmi, lParam, true);
            }

            // Set monitor size
            CurrentMonitorSize = new Rectangle(currentX, currentY, currentWidth + currentX, currentHeight + currentY);

            // Get margin around window
            CurrentMonitorMargin = new Thickness(
                (lCurrentScreenInfo.RCWork.Left - lCurrentScreenInfo.RCMonitor.Left) / mMonitorDpi.Value.DpiScaleX,
                (lCurrentScreenInfo.RCWork.Top - lCurrentScreenInfo.RCMonitor.Top) / mMonitorDpi.Value.DpiScaleY,
                (lCurrentScreenInfo.RCMonitor.Right - lCurrentScreenInfo.RCWork.Right) / mMonitorDpi.Value.DpiScaleX,
                (lCurrentScreenInfo.RCMonitor.Bottom - lCurrentScreenInfo.RCWork.Bottom) / mMonitorDpi.Value.DpiScaleY
                );

            // Store new size
            mScreenSize = new Rect(lCurrentScreenInfo.RCWork.Left, lCurrentScreenInfo.RCWork.Top, currentWidth, currentHeight);
        }