WPF中透明窗口实现拖拽功能

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WPF中透明窗口实现拖拽功能

前言

默认创建的窗口是可以拖拽放大缩小的，但是如果窗口设置为透明，就不能拖拽了。

页面

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<Grid Name="ImgGrid" Margin="0,0,0,0">
    <Border
        Margin="5"
        Background="#333333"
        BorderBrush="#2D8CF0"
        BorderThickness="1">
        <Image
            Name="MImg"
            MouseLeftButtonDown="Window_MouseLeftButtonDown_1"
            Source="/Images/TouPing/phone_bg.jpg" />
    </Border>

    <Grid Name="MThumpGrid">
        <Thumb
            Width="16"
            Height="16"
            HorizontalAlignment="Left"
            VerticalAlignment="Top"
            Cursor="ScrollNW"
            DragDelta="LeftTop_DragDelta" />

        <Thumb
            Width="16"
            Height="16"
            HorizontalAlignment="Right"
            VerticalAlignment="Top"
            Cursor="ScrollNE"
            DragDelta="RightTop_DragDelta" />

        <Thumb
            Width="16"
            Height="16"
            HorizontalAlignment="Left"
            VerticalAlignment="Bottom"
            Cursor="ScrollSW"
            DragDelta="LeftBottom_DragDelta" />

        <Thumb
            Width="16"
            Height="16"
            HorizontalAlignment="Right"
            VerticalAlignment="Bottom"
            Cursor="ScrollSE"
            DragDelta="RightBottom_DragDelta" />
    </Grid>
</Grid>

样式调整

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<Window.Resources>
    <Style TargetType="Thumb">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate>
                    <Ellipse
                        Fill="White"
                        Stroke="#2D8CF0"
                        StrokeThickness="2" />
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</Window.Resources>

事件

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private void LeftTop_DragDelta(object sender, DragDeltaEventArgs e)
{
    if (Width <= 400 && e.HorizontalChange > 0)
    {
        return;
    }
    if (Height <= 400 && e.VerticalChange > 0)
    {
        return;
    }
    Left += e.HorizontalChange;
    Top += e.VerticalChange;
    Width -= e.HorizontalChange;
    Height -= e.VerticalChange;
}

private void LeftBottom_DragDelta(object sender, DragDeltaEventArgs e)
{
    if (Width <= 400 && e.HorizontalChange > 0)
    {
        return;
    }
    if (Height <= 400 && e.VerticalChange < 0)
    {
        return;
    }
    Left += e.HorizontalChange;
    Width -= e.HorizontalChange;
    Height += e.VerticalChange;
}

private void RightTop_DragDelta(object sender, DragDeltaEventArgs e)
{
    if (Width <= 400 && e.HorizontalChange < 0)
    {
        return;
    }
    if (Height <= 400 && e.VerticalChange > 0)
    {
        return;
    }
    Top += e.VerticalChange;
    Width += e.HorizontalChange;
    Height -= e.VerticalChange;
}

private void RightBottom_DragDelta(object sender, DragDeltaEventArgs e)
{
    if (Width <= 400 && e.HorizontalChange < 0)
    {
        return;
    }
    if (Height <= 400 && e.VerticalChange < 0)
    {
        return;
    }
    Width += e.HorizontalChange;
    Height += e.VerticalChange;
}