StatusBarDrawItemEventHandler 代理人
重要
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public delegate void StatusBarDrawItemEventHandler(System::Object ^ sender, StatusBarDrawItemEventArgs ^ sbdevent);
public delegate void StatusBarDrawItemEventHandler(object sender, StatusBarDrawItemEventArgs sbdevent);
type StatusBarDrawItemEventHandler = delegate of obj * StatusBarDrawItemEventArgs -> unit
Public Delegate Sub StatusBarDrawItemEventHandler(sender As Object, sbdevent As StatusBarDrawItemEventArgs)
- sender
- Object
事件的來源。
- sbdevent
- StatusBarDrawItemEventArgs
StatusBarDrawItemEventArgs,其中包含事件資料。
下列程式碼範例示範如何使用 StatusBarPanel.Style 屬性、 StatusBarDrawItemEventHandler 委派、類別、 StatusBarPanelStyleStatusBarDrawItemEventArgs 列舉和 Panel 屬性。 若要執行範例,請將下列程式碼貼到表單中。
InitializeStatusBarPanels
在表單的建構函式或 Load 事件處理方法中呼叫 方法。
StatusBar^ StatusBar1;
void InitializeStatusBarPanels()
{
StatusBar1 = gcnew StatusBar;
// Create two StatusBarPanel objects.
StatusBarPanel^ panel1 = gcnew StatusBarPanel;
StatusBarPanel^ panel2 = gcnew StatusBarPanel;
// Set the style of the panels.
// panel1 will be owner-drawn.
panel1->Style = StatusBarPanelStyle::OwnerDraw;
// The panel2 object will be drawn by the operating system.
panel2->Style = StatusBarPanelStyle::Text;
// Set the text of both panels to the same date string.
panel1->Text = System::DateTime::Today.ToShortDateString();
panel2->Text = System::DateTime::Today.ToShortDateString();
// Add both panels to the StatusBar.
StatusBar1->Panels->Add( panel1 );
StatusBar1->Panels->Add( panel2 );
// Make panels visible by setting the ShowPanels
// property to True.
StatusBar1->ShowPanels = true;
// Associate the event-handling method with the DrawItem event
// for the owner-drawn panel.
StatusBar1->DrawItem += gcnew StatusBarDrawItemEventHandler( this, &Form1::DrawCustomStatusBarPanel );
this->Controls->Add( StatusBar1 );
}
// Draw the panel.
void DrawCustomStatusBarPanel( Object^ sender, StatusBarDrawItemEventArgs^ e )
{
// Draw a blue background in the owner-drawn panel.
e->Graphics->FillRectangle( Brushes::AliceBlue, e->Bounds );
// Create a StringFormat object to align text in the panel.
StringFormat^ textFormat = gcnew StringFormat;
// Center the text in the middle of the line.
textFormat->LineAlignment = StringAlignment::Center;
// Align the text to the left.
textFormat->Alignment = StringAlignment::Far;
// Draw the panel's text in dark blue using the Panel
// and Bounds properties of the StatusBarEventArgs object
// and the StringFormat object.
e->Graphics->DrawString( e->Panel->Text, StatusBar1->Font, Brushes::DarkBlue, RectangleF(e->Bounds.X,e->Bounds.Y,e->Bounds.Width,e->Bounds.Height), textFormat );
}
private StatusBar StatusBar1;
private void InitializeStatusBarPanels()
{
StatusBar1 = new StatusBar();
// Create two StatusBarPanel objects.
StatusBarPanel panel1 = new StatusBarPanel();
StatusBarPanel panel2 = new StatusBarPanel();
// Set the style of the panels.
// panel1 will be owner-drawn.
panel1.Style = StatusBarPanelStyle.OwnerDraw;
// The panel2 object will be drawn by the operating system.
panel2.Style = StatusBarPanelStyle.Text;
// Set the text of both panels to the same date string.
panel1.Text = System.DateTime.Today.ToShortDateString();
panel2.Text = System.DateTime.Today.ToShortDateString();
// Add both panels to the StatusBar.
StatusBar1.Panels.Add(panel1);
StatusBar1.Panels.Add(panel2);
// Make panels visible by setting the ShowPanels
// property to True.
StatusBar1.ShowPanels = true;
// Associate the event-handling method with the DrawItem event
// for the owner-drawn panel.
StatusBar1.DrawItem +=
new StatusBarDrawItemEventHandler(DrawCustomStatusBarPanel);
this.Controls.Add(StatusBar1);
}
// Draw the panel.
private void DrawCustomStatusBarPanel(object sender,
StatusBarDrawItemEventArgs e)
{
// Draw a blue background in the owner-drawn panel.
e.Graphics.FillRectangle(Brushes.AliceBlue, e.Bounds);
// Create a StringFormat object to align text in the panel.
StringFormat textFormat = new StringFormat();
// Center the text in the middle of the line.
textFormat.LineAlignment = StringAlignment.Center;
// Align the text to the left.
textFormat.Alignment = StringAlignment.Far;
// Draw the panel's text in dark blue using the Panel
// and Bounds properties of the StatusBarEventArgs object
// and the StringFormat object.
e.Graphics.DrawString(e.Panel.Text, StatusBar1.Font,
Brushes.DarkBlue, new RectangleF(e.Bounds.X,
e.Bounds.Y, e.Bounds.Width, e.Bounds.Height), textFormat);
}
Private StatusBar1 As StatusBar
Private Sub InitializeStatusBarPanels()
StatusBar1 = New StatusBar
' Create two StatusBarPanel objects.
Dim panel1 As New StatusBarPanel
Dim panel2 As New StatusBarPanel
' Set the style of the panels.
' panel1 will be owner-drawn.
panel1.Style = StatusBarPanelStyle.OwnerDraw
' The panel2 object will be drawn by the operating system.
panel2.Style = StatusBarPanelStyle.Text
' Set the text of both panels to the same date string.
panel1.Text = DateTime.Today.ToShortDateString()
panel2.Text = DateTime.Today.ToShortDateString()
' Add both panels to the StatusBar.
StatusBar1.Panels.Add(panel1)
StatusBar1.Panels.Add(panel2)
' Make panels visible by setting the ShowPanels
' property to True.
StatusBar1.ShowPanels = True
' Use the AddHandler syntax to handle the DrawItem event
' for the owner-drawn panel.
AddHandler StatusBar1.DrawItem, _
New StatusBarDrawItemEventHandler( _
AddressOf DrawCustomStatusBarPanel)
Me.Controls.Add(StatusBar1)
End Sub
' Draw the panel.
Private Sub DrawCustomStatusBarPanel(ByVal sender As Object, _
ByVal e As StatusBarDrawItemEventArgs)
' Draw a blue background in the owner-drawn panel.
e.Graphics.FillRectangle(Brushes.AliceBlue, e.Bounds)
' Create a StringFormat object to align text in the panel.
Dim textFormat As New StringFormat
' Center the text in the middle of the line.
textFormat.LineAlignment = StringAlignment.Center
' Align the text to the left.
textFormat.Alignment = StringAlignment.Far
' Draw the panel's text in dark blue using the Panel
' and Bounds properties of the StatusBarEventArgs object
' and the StringFormat object.
e.Graphics.DrawString(e.Panel.Text, StatusBar1.Font, _
Brushes.DarkBlue, New RectangleF(e.Bounds.X, e.Bounds.Y, _
e.Bounds.Width, e.Bounds.Height), textFormat)
End Sub
建立 StatusBarDrawItemEventHandler 委派時,必須識別處理事件的方法。 若要使事件與您的事件處理常式產生關聯,請將委派的執行個體 (Instance) 加入至事件。 除非您移除委派,否則每當事件發生時就會呼叫事件處理常式。 如需事件處理常式委派的詳細資訊,請參閱 處理和引發事件。
Get |
取得表示特定委派所代表之方法的物件。 |
產品 | 版本 |
---|---|
.NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
Windows Desktop | 3.0, 3.1 |