我看到WPF的一些奇怪的行为。我有一个三个按钮的形式。一个按钮应该使窗口全屏,一个应该将它置于当前显示器上,第三个按钮应该将窗口恢复到正常位置。WPF窗口状态从最大化恢复被卡住在奇数状态
的XAML是
<Window x:Class="TestRestore.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:TestRestore"
mc:Ignorable="d"
Title="MainWindow" Height="350" Width="525" ResizeMode="CanResizeWithGrip" WindowStartupLocation="CenterScreen">
<Grid>
<Button Content="Max" HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top" Width="94" Click="max_click" Name="max_button"/>
<Button Content="Center" HorizontalAlignment="Left" Margin="10,35,0,0" VerticalAlignment="Top" Width="94" Click="center_click" Name="center_button"/>
<Button Content="Restore" HorizontalAlignment="Left" Margin="227,143,0,0" VerticalAlignment="Top" Width="75" Click="restore_click" Name="restore_button" IsEnabled="False"/>
</Grid>
</Window>
和代码如下。奇怪的行为是,当我最大化,然后恢复窗口,位置正确地恢复,但窗口仍然认为它是最大化(最大化按钮看起来像一个恢复按钮,即使ResizeMode已设置,您不能调整窗口大小CanResizeWithGrip)。
当最大化的窗口被恢复后,即使窗口位置没有最大化,它仍认为它仍然是最大化的,只需通过拖动标题栏来手动移动窗口就足以使它自己回到非正常状态,最大化模式。
此外,如果我最大化,然后恢复窗口,然后再次最大化它而不移动它,最大化的窗口位置是不正确的(不在左上角)。
神秘加深。如果我最大化然后恢复窗口,然后按alt,然后按下(以获得窗口菜单),然后选择'移动',然后用键盘移动窗口,它仍然停留在'虚假非麻烦模式'即使窗口正在移动,所以它似乎是解除它的唯一方法是用鼠标移动它。
using System;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Interop;
namespace TestRestore
{
public partial class MainWindow : Window
{
WindowStyle old_window_style;
WindowState old_window_state;
double old_left;
double old_top;
double old_width;
double old_height;
public MainWindow()
{
InitializeComponent();
}
// remember position, style and state
private void SaveWindowPos()
{
old_window_style = WindowStyle;
old_window_state = WindowState;
old_left = Left;
old_top = Top;
old_width = Width;
old_height = Height;
max_button.IsEnabled = false;
center_button.IsEnabled = false;
restore_button.IsEnabled = true;
}
// put position, style and state back
private void RestoreWindowPos()
{
WindowStyle = old_window_style;
WindowState = old_window_state;
ResizeMode = ResizeMode.CanResizeWithGrip;
Left = old_left;
Top = old_top;
Width = old_width;
Height = old_height;
max_button.IsEnabled = true;
center_button.IsEnabled = true;
restore_button.IsEnabled = false;
}
// make it centered or fullscreen
private void SetActivePos(bool full_screen)
{
SaveWindowPos();
Hide();
if (full_screen)
{
ResizeMode = ResizeMode.NoResize;
WindowStyle = WindowStyle.None;
WindowState = WindowState.Maximized;
}
else
{
Size s = new Size(800, 600);
Point p = CenterRectInMonitor(this, s);
Left = p.X;
Top = p.Y;
Width = s.Width;
Height = s.Height;
ResizeMode = ResizeMode.NoResize;
WindowState = WindowState.Normal;
}
Show();
}
private void restore_click(object sender, RoutedEventArgs e)
{
Hide();
RestoreWindowPos();
Show();
}
private void max_click(object sender, RoutedEventArgs e)
{
SetActivePos(true);
}
private void center_click(object sender, RoutedEventArgs e)
{
SetActivePos(false);
}
// interop
public const Int32 MONITOR_DEFAULTTOPRIMARY = 0x00000001;
public const Int32 MONITOR_DEFAULTTONEAREST = 0x00000002;
[DllImport("user32.dll")]
public static extern IntPtr MonitorFromWindow(IntPtr handle, Int32 flags);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern bool GetMonitorInfo(IntPtr hMonitor, ref MonitorInfoEx lpmi);
// size of a device name string
private const int CCHDEVICENAME = 32;
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct MonitorInfoEx
{
public int Size;
public RectStruct Monitor;
public RectStruct WorkArea;
public uint Flags;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = CCHDEVICENAME)]
public string DeviceName;
public void Init()
{
this.Size = 40 + 2 * CCHDEVICENAME;
this.DeviceName = string.Empty;
}
}
[StructLayout(LayoutKind.Sequential)]
public struct RectStruct
{
public int Left;
public int Top;
public int Right;
public int Bottom;
public int Width
{
get
{
return Right - Left;
}
}
public int Height
{
get
{
return Bottom - Top;
}
}
}
public static MonitorInfoEx GetMonitorFromWindow(Window w)
{
var hwnd = new WindowInteropHelper(w).EnsureHandle();
var monitor = MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST);
MonitorInfoEx monitor_info = new MonitorInfoEx();
monitor_info.Init();
GetMonitorInfo(monitor, ref monitor_info);
return monitor_info;
}
// work out how a rect of 'Size size' should be centered on the monitor containing 'Window w'
public static Point CenterRectInMonitor(Window w, Size size)
{
var source = PresentationSource.FromVisual(w);
double x_scale = source.CompositionTarget.TransformToDevice.M11;
double y_scale = source.CompositionTarget.TransformToDevice.M22;
var width = size.Width * x_scale;
var height = size.Height * y_scale;
var monitor_info = GetMonitorFromWindow(w);
Size s = new Size(monitor_info.Monitor.Width, monitor_info.Monitor.Height);
Point p = new Point(monitor_info.Monitor.Left, monitor_info.Monitor.Top);
Point c = new Point(p.X + s.Width/2, p.Y + s.Height/2);
return new Point((c.X - width/2)/x_scale, (c.Y - height/2)/y_scale);
}
}
}
谢谢,删除隐藏()和显示()修复它。他们在那里解决了之前设置WindowState的问题,但删除它们似乎没有导致返回。 –