Cara: Membedakan Antara Klik dan Double-Clicks
Biasanya, satu klik memulai tindakan antarmuka pengguna (UI) dan klik ganda memperluas tindakan. Misalnya, satu klik biasanya memilih item, dan klik ganda mengedit item yang dipilih. Namun, peristiwa klik Formulir Windows tidak dengan mudah mengakomodasi skenario di mana klik dan klik ganda melakukan tindakan yang tidak kompatibel, karena tindakan yang terkait dengan Click atau MouseClick peristiwa dilakukan sebelum tindakan terkait dengan DoubleClick atau MouseDoubleClick peristiwa. Topik ini menunjukkan dua solusi untuk masalah ini. Salah satu solusinya adalah menangani peristiwa klik ganda dan mengembalikan tindakan dalam penanganan peristiwa klik. Dalam situasi yang jarang terjadi, Anda mungkin perlu mensimulasikan perilaku klik dan klik dua kali dengan menangani MouseDown peristiwa dan dengan menggunakan DoubleClickTime properti dan DoubleClickSize kelas SystemInformation . Anda mengukur waktu antara klik dan jika klik kedua terjadi sebelum nilai DoubleClickTime tercapai dan klik berada dalam persegi yang ditentukan oleh DoubleClickSize, lakukan tindakan klik ganda; jika tidak, lakukan tindakan klik.
Untuk mengembalikan tindakan klik
Pastikan bahwa kontrol yang Anda kerjakan memiliki perilaku klik ganda standar. Jika tidak, aktifkan kontrol dengan SetStyle metode . Tangani peristiwa klik ganda dan gulung balik tindakan klik serta tindakan klik ganda. Contoh kode berikut menunjukkan cara membuat tombol kustom dengan klik dua kali diaktifkan, serta cara mengembalikan tindakan klik dalam kode penanganan peristiwa klik ganda.
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); } } }
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 ' 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 End Class
Untuk membedakan antara klik dalam peristiwa MouseDown
MouseDown Tangani peristiwa dan tentukan lokasi dan rentang waktu antara klik menggunakan properti dan komponen yang Timer sesuaiSystemInformation. Lakukan tindakan yang sesuai tergantung pada apakah klik atau klik ganda terjadi. Contoh kode berikut menunjukkan bagaimana hal ini dapat dilakukan.
#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); }
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); } } }
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
Mengompilasi Kode
Contoh-contoh ini memerlukan:
- Referensi ke rakitan System, System.Drawing, dan System.Windows.Forms.
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