CheckBoxRenderer Kelas

Definisi

Ruang nama:

System.Windows.Forms

Rakitan:

System.Windows.Forms.dll

Sumber:

CheckBoxRenderer.cs

Menyediakan metode yang digunakan untuk merender kontrol kotak centang dengan atau tanpa gaya visual. Kelas ini tidak dapat diwariskan.

public ref class CheckBoxRenderer abstract sealed

public static class CheckBoxRenderer

type CheckBoxRenderer = class

Public Class CheckBoxRenderer

Warisan

Object

CheckBoxRenderer

Contoh

Contoh kode berikut menunjukkan cara menulis kontrol kustom yang menggunakan DrawCheckBox metode untuk menggambar kotak centang yang merespons klik mouse.

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

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

namespace CheckBoxRendererSample
{
    ref class CustomCheckBox : Control
    {
        private:
        Rectangle textRectangleValue;
        Point clickedLocationValue;
        bool clicked;
        CheckBoxState state;

        public :
        CustomCheckBox() : Control()
        {
            this->textRectangleValue = Rectangle();
            this->clickedLocationValue = Point();
            this->clicked = false;
            this->state = CheckBoxState::UncheckedNormal;
            this->Location = Point(50, 50);
            this->Size = System::Drawing::Size(100, 20);
            this->Text = "Click here";
            this->Font = SystemFonts::IconTitleFont;
        }

        // Calculate the text bounds, exluding the check box.
        Rectangle getTextRectangle()
        {
            Graphics ^g = this->CreateGraphics();
            textRectangleValue.X = ClientRectangle.X +
                        CheckBoxRenderer::GetGlyphSize(g,
                        CheckBoxState::UncheckedNormal).Width;
            textRectangleValue.Y = ClientRectangle.Y;
            textRectangleValue.Width = ClientRectangle.Width -
                        CheckBoxRenderer::GetGlyphSize(g,
                        CheckBoxState::UncheckedNormal).Width;
            textRectangleValue.Height = ClientRectangle.Height;

            delete g;
            return textRectangleValue;
        }

protected:
        // Draw the check box in the current state.
        virtual void OnPaint(PaintEventArgs ^e) override
        {
            Control::OnPaint(e);

            CheckBoxRenderer::DrawCheckBox(e->Graphics,
                ClientRectangle.Location, this->getTextRectangle(), this->Text,
                this->Font, TextFormatFlags::HorizontalCenter,
                clicked, state);
        }


        // Draw the check box in the checked or unchecked state, alternately.
        virtual void OnMouseDown(MouseEventArgs ^e) override
        {
            Control::OnMouseDown(e);

            if (!clicked)
            {
                clicked = true;
                this->Text = "Clicked!";
                state = CheckBoxState::CheckedPressed;
                Invalidate();
            }
            else
            {
                clicked = false;
                this->Text = "Click here";
                state = CheckBoxState::UncheckedNormal;
                Invalidate();
            }
        }

        // Draw the check box in the hot state. 
        virtual void OnMouseHover(EventArgs ^e) override
        {
            Control::OnMouseHover(e);
            state = clicked ? CheckBoxState::CheckedHot :
                CheckBoxState::UncheckedHot;
            Invalidate();
        }

        // Draw the check box in the hot state. 
        virtual void OnMouseUp(MouseEventArgs ^e) override
        {
            Control::OnMouseUp(e);
            this->OnMouseHover(e);
        }

        // Draw the check box in the unpressed state.
        virtual void OnMouseLeave(EventArgs ^e) override
        {
            Control::OnMouseLeave(e);
            state = clicked ? CheckBoxState::CheckedNormal :
                CheckBoxState::UncheckedNormal;
            Invalidate();
        } 
    }; 

    ref class Form1: public Form
    {
    public:
        Form1() : Form() 
        {
            CustomCheckBox ^CheckBox1 = gcnew CustomCheckBox();
            Controls->Add(CheckBox1);

            if (Application::RenderWithVisualStyles) 
            {
                this->Text = "Visual Styles Enabled";
            }
            else 
            {
                this->Text = "Visual Styles Disabled";
            }
        }
    };
}


[STAThread]
int main()
{
    // If you do not call EnableVisualStyles below, then 
    // CheckBoxRenderer.DrawCheckBox automatically detects 
    // this and draws the check box without visual styles.
    Application::EnableVisualStyles();
    Application::Run(gcnew CheckBoxRendererSample::Form1());
}

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

namespace CheckBoxRendererSample
{
    class Form1 : Form
    {
        public Form1()
            : base()
        {
            CustomCheckBox CheckBox1 = new CustomCheckBox();
            Controls.Add(CheckBox1);

            if (Application.RenderWithVisualStyles)
                this.Text = "Visual Styles Enabled";
            else
                this.Text = "Visual Styles Disabled";
        }

        [STAThread]
        static void Main()
        {
            // If you do not call EnableVisualStyles below, then 
            // CheckBoxRenderer.DrawCheckBox automatically detects 
            // this and draws the check box without visual styles.
            Application.EnableVisualStyles();
            Application.Run(new Form1());
        }
    }

    public class CustomCheckBox : Control
    {
        private Rectangle textRectangleValue = new Rectangle();
        private Point clickedLocationValue = new Point();
        private bool clicked = false;
        private CheckBoxState state = CheckBoxState.UncheckedNormal;

        public CustomCheckBox()
            : base()
        {
            this.Location = new Point(50, 50);
            this.Size = new Size(100, 20);
            this.Text = "Click here";
            this.Font = SystemFonts.IconTitleFont;
        }

        // Calculate the text bounds, exluding the check box.
        public Rectangle TextRectangle
        {
            get
            {
                using (Graphics g = this.CreateGraphics())
                {
                    textRectangleValue.X = ClientRectangle.X +
                        CheckBoxRenderer.GetGlyphSize(g,
                        CheckBoxState.UncheckedNormal).Width;
                    textRectangleValue.Y = ClientRectangle.Y;
                    textRectangleValue.Width = ClientRectangle.Width -
                        CheckBoxRenderer.GetGlyphSize(g,
                        CheckBoxState.UncheckedNormal).Width;
                    textRectangleValue.Height = ClientRectangle.Height;
                }

                return textRectangleValue;
            }
        }

        // Draw the check box in the current state.
        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);

            CheckBoxRenderer.DrawCheckBox(e.Graphics,
                ClientRectangle.Location, TextRectangle, this.Text,
                this.Font, TextFormatFlags.HorizontalCenter,
                clicked, state);
        }

        // Draw the check box in the checked or unchecked state, alternately.
        protected override void OnMouseDown(MouseEventArgs e)
        {
            base.OnMouseDown(e);

            if (!clicked)
            {
                clicked = true;
                this.Text = "Clicked!";
                state = CheckBoxState.CheckedPressed;
                Invalidate();
            }
            else
            {
                clicked = false;
                this.Text = "Click here";
                state = CheckBoxState.UncheckedNormal;
                Invalidate();
            }
        }

        // Draw the check box in the hot state. 
        protected override void OnMouseHover(EventArgs e)
        {
            base.OnMouseHover(e);
            state = clicked ? CheckBoxState.CheckedHot :
                CheckBoxState.UncheckedHot;
            Invalidate();
        }

        // Draw the check box in the hot state. 
        protected override void OnMouseUp(MouseEventArgs e)
        {
            base.OnMouseUp(e);
            this.OnMouseHover(e);
        }

        // Draw the check box in the unpressed state.
        protected override void OnMouseLeave(EventArgs e)
        {
            base.OnMouseLeave(e);
            state = clicked ? CheckBoxState.CheckedNormal :
                CheckBoxState.UncheckedNormal;
            Invalidate();
        }
    }
}

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

Namespace CheckBoxRendererSample

    Class Form1
        Inherits Form

        Public Sub New()
            Dim CheckBox1 As New CustomCheckBox()
            Controls.Add(CheckBox1)

            If Application.RenderWithVisualStyles Then
                Me.Text = "Visual Styles Enabled"
            Else
                Me.Text = "Visual Styles Disabled"
            End If
        End Sub

        <STAThread()> _
        Shared Sub Main()
            ' If you do not call EnableVisualStyles below, then 
            ' CheckBoxRenderer.DrawCheckBox automatically detects   
            ' this and draws the check box without visual styles.
            Application.EnableVisualStyles()
            Application.Run(New Form1())
        End Sub
    End Class

    Public Class CustomCheckBox
        Inherits Control

        Private textRectangleValue As New Rectangle()
        Private clickedLocationValue As New Point()
        Private clicked As Boolean = False
        Private state As CheckBoxState = CheckBoxState.UncheckedNormal

        Public Sub New()
            With Me
                .Location = New Point(50, 50)
                .Size = New Size(100, 20)
                .Text = "Click here"
                .Font = SystemFonts.IconTitleFont
            End With
        End Sub

        ' Calculate the text bounds, exluding the check box.
        Public ReadOnly Property TextRectangle() As Rectangle
            Get
                Using g As Graphics = Me.CreateGraphics()
                    With textRectangleValue
                        .X = Me.ClientRectangle.X + _
                            CheckBoxRenderer.GetGlyphSize(g, _
                            CheckBoxState.UncheckedNormal).Width
                        .Y = Me.ClientRectangle.Y
                        .Width = Me.ClientRectangle.Width - _
                            CheckBoxRenderer.GetGlyphSize(g, _
                            CheckBoxState.UncheckedNormal).Width
                        .Height = Me.ClientRectangle.Height
                    End With
                End Using
                Return textRectangleValue
            End Get
        End Property

        ' Draw the check box in the current state.
        Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
            MyBase.OnPaint(e)
            CheckBoxRenderer.DrawCheckBox(e.Graphics, _
                Me.ClientRectangle.Location, TextRectangle, Me.Text, _
                Me.Font, TextFormatFlags.HorizontalCenter, _
                clicked, state)
        End Sub

        ' Draw the check box in the checked or unchecked state, alternately.
        Protected Overrides Sub OnMouseDown(ByVal e As MouseEventArgs)
            MyBase.OnMouseDown(e)
            If Not clicked Then
                With Me
                    .clicked = True
                    .Text = "Clicked!"
                    .state = CheckBoxState.CheckedPressed
                End With
                Invalidate()
            Else
                With Me
                    .clicked = False
                    .Text = "Click here"
                    .state = CheckBoxState.UncheckedNormal
                End With
                Invalidate()
            End If
        End Sub

        ' Draw the check box in the hot state. 
        Protected Overrides Sub OnMouseHover(ByVal e As EventArgs)
            MyBase.OnMouseHover(e)
            If clicked Then
                state = CheckBoxState.CheckedHot
            Else
                state = CheckBoxState.UncheckedHot
            End If
            Invalidate()
        End Sub

        ' Draw the check box in the hot state. 
        Protected Overrides Sub OnMouseUp(ByVal e As MouseEventArgs)
            MyBase.OnMouseUp(e)
            Me.OnMouseHover(e)
        End Sub

        ' Draw the check box in the unpressed state.
        Protected Overrides Sub OnMouseLeave(ByVal e As EventArgs)
            MyBase.OnMouseLeave(e)
            If clicked Then
                state = CheckBoxState.CheckedNormal
            Else
                state = CheckBoxState.UncheckedNormal
            End If
            Invalidate()
        End Sub

    End Class
End Namespace

Keterangan

Kelas CheckBoxRenderer menyediakan sekumpulan static metode yang dapat digunakan untuk merender kontrol kotak centang. Merender kontrol mengacu pada menggambar antarmuka pengguna kontrol. Untuk menggambar kotak centang, gunakan salah DrawCheckBox satu metode. Metode ini menyediakan berbagai opsi, seperti menggambar teks atau gambar dengan kotak centang.

Jika gaya visual diaktifkan dalam sistem operasi dan gaya visual diterapkan ke aplikasi saat ini, DrawCheckBox akan menggambar kotak centang dengan gaya visual saat ini. Jika tidak, DrawCheckBox akan menggambar kotak centang dengan gaya Windows klasik. Ini berguna jika Anda menggambar kontrol kustom yang seharusnya secara otomatis cocok dengan pengaturan gaya visual sistem operasi saat ini.

Kelas ini membungkus fungsionalitas System.Windows.Forms.VisualStyles.VisualStyleRenderer yang diatur ke salah satu elemen yang diekspos oleh System.Windows.Forms.VisualStyles.VisualStyleElement.Button.CheckBox kelas . Untuk informasi selengkapnya, lihat Kontrol Penyajian dengan Gaya Visual.

Properti

Nama	Deskripsi
RenderMatchingApplicationState	Mendapatkan atau menetapkan nilai yang menunjukkan apakah perender menggunakan status aplikasi untuk menentukan gaya penyajian.

Metode

Nama	Deskripsi
DrawCheckBox(Graphics, Point, CheckBoxState)	Menggambar kontrol kotak centang dalam status dan lokasi yang ditentukan.
DrawCheckBox(Graphics, Point, Rectangle, String, Font, Boolean, CheckBoxState)	Menggambar kontrol kotak centang dalam status dan lokasi yang ditentukan, dengan teks yang ditentukan, dan dengan persegi panjang fokus opsional.
DrawCheckBox(Graphics, Point, Rectangle, String, Font, Image, Rectangle, Boolean, CheckBoxState)	Menggambar kontrol kotak centang dalam status dan lokasi yang ditentukan, dengan teks dan gambar yang ditentukan, dan dengan persegi panjang fokus opsional.
DrawCheckBox(Graphics, Point, Rectangle, String, Font, TextFormatFlags, Boolean, CheckBoxState)	Menggambar kontrol kotak centang dalam status dan lokasi yang ditentukan, dengan pemformatan teks dan teks yang ditentukan, dan dengan persegi fokus opsional.
DrawCheckBox(Graphics, Point, Rectangle, String, Font, TextFormatFlags, Image, Rectangle, Boolean, CheckBoxState)	Menggambar kontrol kotak centang dalam status dan lokasi yang ditentukan; dengan teks, pemformatan teks, dan gambar yang ditentukan; dan dengan persegi panjang fokus opsional.
DrawParentBackground(Graphics, Rectangle, Control)	Menggambar latar belakang induk kontrol di area yang ditentukan.
GetGlyphSize(Graphics, CheckBoxState)	Mengembalikan ukuran glyph kotak centang.
IsBackgroundPartiallyTransparent(CheckBoxState)	Menunjukkan apakah latar belakang kotak centang memiliki potongan semitransparan atau alpha-blended.

Lihat juga

• EnableVisualStyles()
• RenderWithVisualStyles
• VisualStyleRenderer
• VisualStyleElement