HOW TO：區分按一下和按兩下

發行項
08/12/2011

一般而言，按一下 (Click) 會啟始使用者介面 (UI) 的動作，而按兩下 (Double-Click) 則是延伸這項動作。例如，按一下通常是選取項目，按兩下則是編輯這個已選取的項目。但是，Windows Form 的 Click 事件無法直接適用於按一下和按兩下為執行不相容動作的情形，這是因為與 Click 或 MouseClick 事件相關聯的動作會在與 DoubleClick 或 MouseDoubleClick 事件相關聯的動作之前執行。這個主題示範這個問題的兩種方案。其中一個方案是，處理 Double-Click 事件並且復原 Click 事件的處理動作。在極少數情況下，您可能需要藉由處理 MouseDown 事件，然後使用 SystemInformation 類別的 DoubleClickTime 和 DoubleClickSize 屬性，來模擬按一下行為和按兩下行為。接著，再測量兩次按一下之間的間隔時間，如果第二次按一下是在 DoubleClickTime 值之前發生，而且位置是在 DoubleClickSize 定義的矩形之內，則執行按兩下動作；在其他情況下則執行按一下動作。

若要復原按一下動作

請確認您正在操作的控制項具備標準按兩下行為。如果沒有的話，請以 SetStyle 方法啟用該控制項。請處理 Double-Click 事件並復原按一下動作和按兩下動作。下列程式碼程式示範如何利用已啟用的按兩下功能來建立自訂按鈕，以及如何復原在 Double-Click 事件處理程式碼中的按一下動作。

Imports System
Imports System.ComponentModel
Imports System.Drawing
Imports System.Text
Imports System.Windows.Forms



Public Class Form1
    Inherits Form
    Private WithEvents button1 As DoubleClickButton
    Private initialStyle As FormBorderStyle

    Public Sub New() 
        Me.SuspendLayout()
        initialStyle = Me.FormBorderStyle
        Me.ClientSize = New System.Drawing.Size(292, 266)
        button1 = New DoubleClickButton()
        button1.Location = New Point(40, 40)
        button1.AutoSize = True
        button1.Text = "Click or Double Click"
        Me.Controls.Add(button1)
        Me.Name = "Form1"
        Me.ResumeLayout(False)
        Me.PerformLayout()

    End Sub 'New


    ' Handle the double click event.
    Private Sub button1_DoubleClick(ByVal sender As Object, ByVal e As EventArgs) _
        Handles button1.DoubleClick

        ' Change the border style back to the initial style.
        Me.FormBorderStyle = initialStyle
        MessageBox.Show("Rolled back single click change.")

    End Sub


    ' Handle the click event.
    Private Sub button1_Click(ByVal sender As Object, ByVal e As EventArgs) _
         Handles button1.Click

        Me.FormBorderStyle = FormBorderStyle.FixedToolWindow

    End Sub


    <STAThread()> _
    Shared Sub Main()
        Application.EnableVisualStyles()
        Application.Run(New Form1())

    End Sub
End Class

Public Class DoubleClickButton
    Inherits Button

    Public Sub New() 
        ' Set the style so a double click event occurs.
        SetStyle(ControlStyles.StandardClick Or ControlStyles.StandardDoubleClick, True)

    End Sub 'New
End Class 'DoubleClickButton

using System;
using System.ComponentModel;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace MouseRollBackSingleClick
{
    public class Form1 : Form
    {
        private DoubleClickButton button1;
        private FormBorderStyle initialStyle;

        public Form1()
        {
            initialStyle = this.FormBorderStyle;
            this.ClientSize = new System.Drawing.Size(292, 266);
            button1 = new DoubleClickButton();
            button1.Location = new Point (40,40);
            button1.Click += new EventHandler(button1_Click);
            button1.AutoSize = true;
            this.AllowDrop = true;
            button1.Text = "Click or Double Click";
            button1.DoubleClick += new EventHandler(button1_DoubleClick);
            this.Controls.Add(button1);

        }


        // Handle the double click event.
        void button1_DoubleClick(object sender, EventArgs e)
        {
            // Change the border style back to the initial style.
            this.FormBorderStyle = initialStyle;
            MessageBox.Show("Rolled back single click change.");
        }

        // Handle the click event.
        void button1_Click(object sender, EventArgs e)
        {
            this.FormBorderStyle = FormBorderStyle.FixedToolWindow;
        }

        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.Run(new Form1());
        }


    }
    public class DoubleClickButton : Button
    {
        public DoubleClickButton() : base()
        {
            // Set the style so a double click event occurs.
            SetStyle(ControlStyles.StandardClick | 
                ControlStyles.StandardDoubleClick, true);
        }
    }
}

若要在 MouseDown 事件中區分按一下

請處理 MouseDown 事件，並且使用適當的 SystemInformation 屬性和 Timer 元件來判斷其位置以及兩次按一下之間的時間差。請依照發生的行為是按一下或按兩下來執行適當的動作。下列程式碼範例示範如何進行這項作業：

Imports System
Imports System.Drawing
Imports System.Windows.Forms

Namespace SingleVersusDoubleClick

    Class Form1
        Inherits Form
        Private hitTestRectangle As New Rectangle()
        Private doubleClickRectangle As New Rectangle()
        Private textBox1 As New TextBox()
        Private WithEvents doubleClickTimer As New Timer()
        Private doubleClickBar As New ProgressBar()
        Private label1 As New Label()
        Private label2 As New Label()
        Private isFirstClick As Boolean = True
        Private isDoubleClick As Boolean = False
        Private milliseconds As Integer = 0

        <STAThread()> _
        Public Shared Sub Main()
            Application.EnableVisualStyles()
            Application.Run(New Form1())
        End Sub

        Public Sub New()
            label1.Location = New Point(30, 5)
            label1.Size = New Size(100, 15)
            label1.Text = "Hit test rectangle:"

            label2.Location = New Point(30, 70)
            label2.Size = New Size(100, 15)
            label2.Text = "Double click timer:"

            hitTestRectangle.Location = New Point(30, 20)
            hitTestRectangle.Size = New Size(100, 40)
            doubleClickTimer.Interval = 100

            doubleClickBar.Location = New Point(30, 85)
            doubleClickBar.Minimum = 0
            doubleClickBar.Maximum = SystemInformation.DoubleClickTime

            textBox1.Location = New Point(30, 120)
            textBox1.Size = New Size(200, 100)
            textBox1.AutoSize = False
            textBox1.Multiline = True

            Me.Controls.Add(doubleClickBar)
            Me.Controls.Add(textBox1)
            Me.Controls.Add(label1)
            Me.Controls.Add(label2)
        End Sub

        ' Detect a valid single click or double click.
        Sub Form1_MouseDown(ByVal sender As Object, _
            ByVal e As MouseEventArgs) Handles Me.MouseDown

            ' Verify that the mouse click is in the main hit
            ' test rectangle.
            If Not hitTestRectangle.Contains(e.Location) Then
                Return
            End If

            ' This is the first mouse click.
            If isFirstClick = True Then
                isFirstClick = False

                ' Determine the location and size of the double click 
                ' rectangle to draw around the cursor point.
                doubleClickRectangle = New Rectangle( _
                    e.X - (SystemInformation.DoubleClickSize.Width / 2), _
                    e.Y - (SystemInformation.DoubleClickSize.Height / 2), _
                    SystemInformation.DoubleClickSize.Width, _
                    SystemInformation.DoubleClickSize.Height)
                Invalidate()

                ' Start the double click timer.
                doubleClickTimer.Start()

            ' This is the second mouse click.
            Else
                ' Verify that the mouse click is within the double click
                ' rectangle and is within the system-defined double 
                ' click period.
                If doubleClickRectangle.Contains(e.Location) And _
                    milliseconds < SystemInformation.DoubleClickTime Then
                    isDoubleClick = True
                End If
            End If
        End Sub

        Sub doubleClickTimer_Tick(ByVal sender As Object, _
            ByVal e As EventArgs) Handles doubleClickTimer.Tick

            milliseconds += 100
            doubleClickBar.Increment(100)

            ' The timer has reached the double click time limit.
            If milliseconds >= SystemInformation.DoubleClickTime Then
                doubleClickTimer.Stop()

                If isDoubleClick Then
                    textBox1.AppendText("Perform double click action")
                    textBox1.AppendText(Environment.NewLine)
                Else
                    textBox1.AppendText("Perform single click action")
                    textBox1.AppendText(Environment.NewLine)
                End If

                ' Allow the MouseDown event handler to process clicks again.
                isFirstClick = True
                isDoubleClick = False
                milliseconds = 0
                doubleClickBar.Value = 0
            End If
        End Sub

        ' Paint the hit test and double click rectangles.
        Sub Form1_Paint(ByVal sender As Object, _
            ByVal e As PaintEventArgs) Handles Me.Paint

            ' Draw the border of the main hit test rectangle.
            e.Graphics.DrawRectangle(Pens.Black, hitTestRectangle)

            ' Fill in the double click rectangle.
            e.Graphics.FillRectangle(Brushes.Blue, doubleClickRectangle)
        End Sub
    End Class
End Namespace

using System;
using System.Drawing;
using System.Windows.Forms;

namespace SingleVersusDoubleClick
{
    class Form1 : Form
    {
        private Rectangle hitTestRectangle = new Rectangle();
        private Rectangle doubleClickRectangle = new Rectangle();
        private TextBox textBox1 = new TextBox();
        private Timer doubleClickTimer = new Timer();
        private ProgressBar doubleClickBar = new ProgressBar();
        private Label label1 = new Label();
        private Label label2 = new Label();
        private bool isFirstClick = true;
        private bool isDoubleClick = false;
        private int milliseconds = 0;

        [STAThread]
        public static void Main()
        {
            Application.EnableVisualStyles();
            Application.Run(new Form1());
        }

        public Form1()
        {
            label1.Location = new Point(30, 5);
            label1.Size = new Size(100, 15);
            label1.Text = "Hit test rectangle:";

            label2.Location = new Point(30, 70);
            label2.Size = new Size(100, 15);
            label2.Text = "Double click timer:";

            hitTestRectangle.Location = new Point(30, 20);
            hitTestRectangle.Size = new Size(100, 40);

            doubleClickTimer.Interval = 100;
            doubleClickTimer.Tick +=
                new EventHandler(doubleClickTimer_Tick);

            doubleClickBar.Location = new Point(30, 85);
            doubleClickBar.Minimum = 0;
            doubleClickBar.Maximum = SystemInformation.DoubleClickTime;

            textBox1.Location = new Point(30, 120);
            textBox1.Size = new Size(200, 100);
            textBox1.AutoSize = false;
            textBox1.Multiline = true;

            this.Paint += new PaintEventHandler(Form1_Paint);
            this.MouseDown += new MouseEventHandler(Form1_MouseDown);
            this.Controls.AddRange(new Control[] { doubleClickBar, textBox1, 
                label1, label2 });
        }

        // Detect a valid single click or double click.
        void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            // Verify that the mouse click is in the main hit
            // test rectangle.
            if (!hitTestRectangle.Contains(e.Location))
            {
                return;
            }

            // This is the first mouse click.
            if (isFirstClick)
            {
                isFirstClick = false;

                // Determine the location and size of the double click 
                // rectangle area to draw around the cursor point.
                doubleClickRectangle = new Rectangle(
                    e.X - (SystemInformation.DoubleClickSize.Width / 2),
                    e.Y - (SystemInformation.DoubleClickSize.Height / 2),
                    SystemInformation.DoubleClickSize.Width,
                    SystemInformation.DoubleClickSize.Height);
                Invalidate();

                // Start the double click timer.
                doubleClickTimer.Start();
            }

            // This is the second mouse click.
            else
            {
                // Verify that the mouse click is within the double click
                // rectangle and is within the system-defined double 
                // click period.
                if (doubleClickRectangle.Contains(e.Location) &&
                    milliseconds < SystemInformation.DoubleClickTime)
                {
                    isDoubleClick = true;
                }
            }
        }

        void doubleClickTimer_Tick(object sender, EventArgs e)
        {
            milliseconds += 100;
            doubleClickBar.Increment(100);

            // The timer has reached the double click time limit.
            if (milliseconds >= SystemInformation.DoubleClickTime)
            {
                doubleClickTimer.Stop();

                if (isDoubleClick)
                {
                    textBox1.AppendText("Perform double click action");
                    textBox1.AppendText(Environment.NewLine);
                }
                else
                {
                    textBox1.AppendText("Perform single click action");
                    textBox1.AppendText(Environment.NewLine);
                }

                // Allow the MouseDown event handler to process clicks again.
                isFirstClick = true;
                isDoubleClick = false;
                milliseconds = 0;
                doubleClickBar.Value = 0;
            }
        }

        // Paint the hit test and double click rectangles.
        void Form1_Paint(object sender, PaintEventArgs e)
        {
            // Draw the border of the main hit test rectangle.
            e.Graphics.DrawRectangle(Pens.Black, hitTestRectangle);

            // Fill in the double click rectangle.
            e.Graphics.FillRectangle(Brushes.Blue, doubleClickRectangle);
        }
    }
}

#using <System.Drawing.dll>
#using <System.Windows.Forms.dll>
#using <System.dll>

using namespace System;
using namespace System::Drawing;
using namespace System::Windows::Forms;

namespace SingleVersusDoubleClick
{
    public ref class Form1 : public Form
    {
    private:
        Rectangle hitTestRectangle;
    private:
        Rectangle doubleClickRectangle;
    private:
        TextBox^ outputBox;
    private:
        Timer^ doubleClickTimer;
    private:
        ProgressBar^ doubleClickBar;
    private:
        Label^ hitTestLabel;
    private:
        Label^ timerLabel;
    private:
        bool isFirstClick;
    private:
        bool isDoubleClick;
    private:
        int milliseconds;

    public:
        Form1()
        {
            hitTestRectangle = Rectangle();
            hitTestRectangle.Location = Point(30, 20);
            hitTestRectangle.Size = System::Drawing::Size(100, 40);

            doubleClickRectangle = Rectangle();

            outputBox = gcnew TextBox();
            outputBox->Location = Point(30, 120);
            outputBox->Size = System::Drawing::Size(200, 100);
            outputBox->AutoSize = false;
            outputBox->Multiline = true;

            doubleClickTimer = gcnew Timer();
            doubleClickTimer->Interval = 100;
            doubleClickTimer->Tick +=
                gcnew EventHandler(this, &Form1::doubleClickTimer_Tick);

            doubleClickBar = gcnew ProgressBar();
            doubleClickBar->Location = Point(30, 85);
            doubleClickBar->Minimum = 0;
            doubleClickBar->Maximum = SystemInformation::DoubleClickTime;

            hitTestLabel = gcnew Label();
            hitTestLabel->Location = Point(30, 5);
            hitTestLabel->Size = System::Drawing::Size(100, 15);
            hitTestLabel->Text = "Hit test rectangle:";

            timerLabel = gcnew Label();
            timerLabel->Location = Point(30, 70);
            timerLabel->Size = System::Drawing::Size(100, 15);
            timerLabel->Text = "Double click timer:";

            isFirstClick = true;

            this->Paint += gcnew PaintEventHandler(this, &Form1::Form1_Paint);
            this->MouseDown += 
                gcnew MouseEventHandler(this, &Form1::Form1_MouseDown);
            this->Controls->
                AddRange(gcnew array<Control^> { doubleClickBar, outputBox,
                hitTestLabel, timerLabel });
        }

        // Detect a valid single click or double click.
    private:
        void Form1_MouseDown(Object^ sender, MouseEventArgs^ e)
        {
            // Verify that the mouse click is in the main hit
            // test rectangle.
            if (!hitTestRectangle.Contains(e->Location))
            {
                return;
            }

            // This is the first mouse click.
            if (isFirstClick)
            {
                isFirstClick = false;

                // Determine the location and size of the double click
                // rectangle area to draw around the cursor point.
                doubleClickRectangle = Rectangle(
                    e->X - (SystemInformation::DoubleClickSize.Width / 2),                    
                    e->Y - (SystemInformation::DoubleClickSize.Height / 2),                    
                    SystemInformation::DoubleClickSize.Width,                    
                    SystemInformation::DoubleClickSize.Height);
                Invalidate();

                // Start the double click timer.
                doubleClickTimer->Start();
            }

            // This is the second mouse click.
            else
            {
                // Verify that the mouse click is within the double click
                // rectangle and is within the system-defined double
                // click period.
                if (doubleClickRectangle.Contains(e->Location) &&
                    milliseconds < SystemInformation::DoubleClickTime)
                {
                    isDoubleClick = true;
                }
            }
        }

    private:
        void doubleClickTimer_Tick(Object^ sender, EventArgs^ e)
        {
            milliseconds += 100;
            doubleClickBar->Increment(100);

            // The timer has reached the double click time limit.
            if (milliseconds >= SystemInformation::DoubleClickTime)
            {
                doubleClickTimer->Stop();

                if (isDoubleClick)
                {
                    outputBox->AppendText("Perform double click action");
                    outputBox->AppendText(Environment::NewLine);
                }
                else
                {
                    outputBox->AppendText("Perform single click action");
                    outputBox->AppendText(Environment::NewLine);
                }

                // Allow the MouseDown event handler to process clicks again.
                isFirstClick = true;
                isDoubleClick = false;
                milliseconds = 0;
                doubleClickBar->Value = 0;
            }
        }

        // Paint the hit test and double click rectangles.
    private:
        void Form1_Paint(Object^ sender, PaintEventArgs^ e)
        {
            // Draw the border of the main hit test rectangle.
            e->Graphics->DrawRectangle(Pens::Black, hitTestRectangle);

            // Fill in the double click rectangle.
            e->Graphics->FillRectangle(Brushes::Blue, doubleClickRectangle);
        }
    };
}


[STAThread]
int main()
{
    Application::EnableVisualStyles();
    Application::Run(gcnew SingleVersusDoubleClick::Form1);
}

編譯程式碼

這些範例需要：

System、System.Drawing 和 System.Windows.Forms 組件的參考。

如需從 Visual Basic 或 Visual C# 的命令列建置 (Build) 這些範例的資訊，請參閱從命令列建置 (Visual Basic) 或使用 csc.exe 建置命令列。您也可以透過將程式碼貼入新的專案，在 Visual Studio 中建置這些範例。如需詳細資訊，請參閱HOW TO：使用 Visual Studio 編譯及執行完整的 Windows Form 程式碼範例和 HOW TO：使用 Visual Studio 編譯及執行完整的 Windows Form 程式碼範例和 HOW TO：使用 Visual Studio 編譯及執行完整的 Windows Form 程式碼範例和 HOW TO：使用 Visual Studio 編譯及執行完整的 Windows Form 程式碼範例和如何：使用 Visual Studio 編譯及執行完整的 Windows Form 程式碼範例.

請參閱

其他資源

Windows Form 應用程式中的滑鼠輸入

共用方式為

HOW TO：區分按一下和按兩下

若要復原按一下動作

若要在 MouseDown 事件中區分按一下

編譯程式碼

請參閱

其他資源

其他資源