有没有办法确定在任何桌面连接的显示器中当前是否可以看到打开的WPF窗口?通过可见,我的意思是窗口的边界矩形与任何监视器的桌面矩形相交。
我需要此功能来确定是否需要重新定位窗口,因为监视器配置(工作区域边界,监视器计数)在应用程序重新启动(保存窗口位置)之间发生了变化。
我已经提出了下面的代码,它似乎有效,但它有几个问题:
您是否知道解决上述部分或全部3个问题的解决方案?
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Forms;
using System.Windows.Media;
internal static class Desktop
{
private static Size dpiFactor = new Size(1.0, 1.0);
private static bool isInitialized;
public static IEnumerable<Rect> WorkingAreas
{
get
{
return
Screen.AllScreens.Select(
screen =>
new Rect(
screen.WorkingArea.Left * dpiFactor.Width,
screen.WorkingArea.Top * dpiFactor.Height,
screen.WorkingArea.Width * dpiFactor.Width,
screen.WorkingArea.Height * dpiFactor.Height));
}
}
public static void TryInitialize(Visual visual)
{
if (isInitialized)
{
return;
}
var ps = PresentationSource.FromVisual(visual);
if (ps == null)
{
return;
}
var ct = ps.CompositionTarget;
if (ct == null)
{
return;
}
var m = ct.TransformToDevice;
dpiFactor = new Size(m.M11, m.M22);
isInitialized = true;
}
}
(初始化的)Desktop
类的用法:
private bool IsLocationValid(Rect windowRectangle)
{
foreach (var workingArea in Desktop.WorkingAreas)
{
var intersection = Rect.Intersect(windowRectangle, workingArea);
var minVisible = new Size(10.0, 10.0);
if (intersection.Width >= minVisible.Width &&
intersection.Height >= minVisible.Height)
{
return true;
}
}
return false;
}
更新
使用虚拟屏幕(SystemParameters.VirtualScreen*
)不起作用,因为使用多个显示器时,“桌面”不是简单的矩形。它可能是一个多边形。虚拟屏幕中会出现盲点,因为
答案 0 :(得分:7)
我们用来做类似事情的代码使用来自SystemParameters的信息,特别是SystemParameter.VirtualScreenLeft,Top,Width和Height。
如果我们有一个保存的位置和大小,那么我们确定窗口是否超出界限:
bool outOfBounds =
(location.X <= SystemParameters.VirtualScreenLeft - size.Width) ||
(location.Y <= SystemParameters.VirtualScreenTop - size.Height) ||
(SystemParameters.VirtualScreenLeft +
SystemParameters.VirtualScreenWidth <= location.X) ||
(SystemParameters.VirtualScreenTop +
SystemParameters.VirtualScreenHeight <= location.Y);
答案 1 :(得分:0)
此代码检查窗口左上角是否在虚拟屏幕框内(包含所有可用屏幕的矩形)。它还负责多监视器设置,其中坐标可以是负数,例如右侧或底部的主监视器。
bool valid_position =
SystemParameters.VirtualScreenLeft <= saved_location.X &&
(SystemParameters.VirtualScreenLeft + SystemParameters.VirtualScreenWidth) >= saved_location.X &&
SystemParameters.VirtualScreenTop <= saved_location.Y &&
(SystemParameters.VirtualScreenTop + SystemParameters.VirtualScreenHeight) >= saved_location.Y;
答案 2 :(得分:0)
我在启动时使用我的WPF项目中剪切的代码;它是用vb.net编写的:
If My.Settings.RememberWindowPositionAndSize Then
If My.Settings.winMainWinState > 2 Then My.Settings.winMainWinState = WindowState.Normal
If My.Settings.winMainWinState = WindowState.Minimized Then My.Settings.winMainWinState = WindowState.Normal
Me.WindowState = My.Settings.winMainWinState
If My.Settings.winMainWinState = WindowState.Normal Then
Dim winBounds As New System.Drawing.Rectangle(CInt(My.Settings.winMainPosX), CInt(My.Settings.winMainPosY),
CInt(My.Settings.winMainSizeB), CInt(My.Settings.winMainSizeH))
For Each scr As System.Windows.Forms.Screen In System.Windows.Forms.Screen.AllScreens
If winBounds.IntersectsWith(scr.Bounds) Then
Me.Width = My.Settings.winMainSizeB
Me.Height = My.Settings.winMainSizeH
Me.Top = My.Settings.winMainPosY
Me.Left = My.Settings.winMainPosX
Exit For
End If
Next
End If
End If
这里是C#中相同(转换)的代码
if (My.Settings.RememberWindowPositionAndSize) {
if (My.Settings.winMainWinState > 2)
My.Settings.winMainWinState = WindowState.Normal;
if (My.Settings.winMainWinState == WindowState.Minimized)
My.Settings.winMainWinState = WindowState.Normal;
this.WindowState = My.Settings.winMainWinState;
if (My.Settings.winMainWinState == WindowState.Normal) {
System.Drawing.Rectangle winBounds = new System.Drawing.Rectangle(Convert.ToInt32(My.Settings.winMainPosX), Convert.ToInt32(My.Settings.winMainPosY), Convert.ToInt32(My.Settings.winMainSizeB), Convert.ToInt32(My.Settings.winMainSizeH));
foreach (System.Windows.Forms.Screen scr in System.Windows.Forms.Screen.AllScreens) {
if (winBounds.IntersectsWith(scr.Bounds)) {
this.Width = My.Settings.winMainSizeB;
this.Height = My.Settings.winMainSizeH;
this.Top = My.Settings.winMainPosY;
this.Left = My.Settings.winMainPosX;
break;
}
}
}
}