ButtonRenderer.DrawParentBackground(Graphics, Rectangle, Control) 方法

定义

命名空间:

System.Windows.Forms

程序集:

System.Windows.Forms.dll

在指定区域中绘制控件的父级的背景。

public:
 static void DrawParentBackground(System::Drawing::Graphics ^ g, System::Drawing::Rectangle bounds, System::Windows::Forms::Control ^ childControl);

public static void DrawParentBackground (System.Drawing.Graphics g, System.Drawing.Rectangle bounds, System.Windows.Forms.Control childControl);

static member DrawParentBackground : System.Drawing.Graphics * System.Drawing.Rectangle * System.Windows.Forms.Control -> unit

Public Shared Sub DrawParentBackground (g As Graphics, bounds As Rectangle, childControl As Control)

参数

g

Graphics

用于绘制 childControl 的父级的背景的 Graphics。

bounds

Rectangle

一个 Rectangle，将在其中绘制父控件的背景。 此矩形应位于子控件的边界之内。

childControl

Control

将绘制其父控件的背景的控件。

示例

下面的代码示例使用 DrawParentBackground 方法在自定义控件的某个区域上绘制。 此代码示例是为 ButtonRenderer 类提供的一个更大示例的一部分。

    // Draw the large or small button, depending on the current state.
protected:
    virtual void OnPaint(PaintEventArgs^ e) override
    {
        __super::OnPaint(e);

        // Draw the smaller pressed button image
        if (state == PushButtonState::Pressed)
        {
            // Set the background color to the parent if visual styles
            // are disabled, because DrawParentBackground will only paint
            // over the control background if visual styles are enabled.
            if (Application::RenderWithVisualStyles)
            {
                this->BackColor = Color::Azure;
            }
            else
            {
                this->BackColor = this->Parent->BackColor;
            }


            // If you comment out the call to DrawParentBackground,
            // the background of the control will still be visible
            // outside the pressed button, if visual styles are enabled.
            ButtonRenderer::DrawParentBackground(e->Graphics,
                ClientRectangle, this);
            ButtonRenderer::DrawButton(e->Graphics, ClickRectangle,
                this->Text, this->Font, true, state);
        }

        // Draw the bigger unpressed button image.
        else
        {
            ButtonRenderer::DrawButton(e->Graphics, ClientRectangle,
                this->Text, this->Font, false, state);
        }
    }

// Draw the large or small button, depending on the current state.
protected override void OnPaint(PaintEventArgs e)
{
    base.OnPaint(e);

    // Draw the smaller pressed button image
    if (state == PushButtonState.Pressed)
    {
        // Set the background color to the parent if visual styles  
        // are disabled, because DrawParentBackground will only paint  
        // over the control background if visual styles are enabled.
        this.BackColor = Application.RenderWithVisualStyles ?
            Color.Azure : this.Parent.BackColor;

        // If you comment out the call to DrawParentBackground, 
        // the background of the control will still be visible 
        // outside the pressed button, if visual styles are enabled.
        ButtonRenderer.DrawParentBackground(e.Graphics,
            ClientRectangle, this);
        ButtonRenderer.DrawButton(e.Graphics, ClickRectangle,
            this.Text, this.Font, true, state);
    }

    // Draw the bigger unpressed button image.
    else
    {
        ButtonRenderer.DrawButton(e.Graphics, ClientRectangle,
            this.Text, this.Font, false, state);
    }
}

' Draw the large or small button, depending on the current state.
Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
    MyBase.OnPaint(e)

    ' Draw the smaller pressed button image.
    If state = PushButtonState.Pressed Then
        ' Set the background color to the parent if visual styles  
        ' are disabled, because DrawParentBackground will only paint  
        ' over the control background if visual styles are enabled.
        If Application.RenderWithVisualStyles Then
            Me.BackColor = Color.Azure
        Else
            Me.BackColor = Me.Parent.BackColor
        End If

        ' If you comment out the call to DrawParentBackground,   
        ' the background of the control will still be visible 
        ' outside the pressed button, if visual styles are enabled.
        ButtonRenderer.DrawParentBackground(e.Graphics, _
            Me.ClientRectangle, Me)
        ButtonRenderer.DrawButton(e.Graphics, ClickRectangle, _
            Me.Text, Me.Font, True, state)

    ' Draw the bigger unpressed button image.
    Else
        ButtonRenderer.DrawButton(e.Graphics, Me.ClientRectangle, _
            Me.Text, Me.Font, False, state)
    End If
End Sub