ScrollBarRenderer クラス
メモ : このクラスは、.NET Framework version 2.0 で新しく追加されたものです。 visual スタイルを使用してスクロール バー コントロールを描画するメソッドを用意します。このクラスは継承できません。 名前空間: System.Windows.Forms
アセンブリ: System.Windows.Forms (system.windows.forms.dll 内)
構文
解説
使用例
継承階層
スレッド セーフ
プラットフォーム
バージョン情報
参照
アセンブリ: System.Windows.Forms (system.windows.forms.dll 内)
構文解説ScrollBarRenderer クラスには、オペレーティング システムの現在の visual スタイルを使用してスクロール バー コントロールを描画するために使用できる、一連の static メソッドが用意されています。コントロールの描画とは、コントロールのユーザー インターフェイスを描画することです。これは、現在の visual スタイルの外観を持つカスタム コントロールを描画する場合に役立ちます。スクロール バーを描画するには、このクラスのメソッドを組み合わせて使用することにより、スクロール バーの各部分を描画します。
オペレーティング システムで visual スタイルが有効にされており、visual スタイルがアプリケーション ウィンドウのクライアント領域に適用されている場合、このクラスのメソッドは現在の visual スタイルを使用してスクロール バーを描画します。それ以外の場合、このクラスのメソッドは InvalidOperationException をスローします。このクラスのメンバを使用できるかどうかを判断するには、IsSupported プロパティの値を確認します。
このクラスは、System.Windows.Forms.VisualStyles.VisualStyleElement.ScrollBar クラスが公開する要素のいずれかに設定された System.Windows.Forms.VisualStyles.VisualStyleRenderer の機能をラップします。詳細については、「visual スタイルが使用されているコントロールのレンダリング」を参照してください。
Windows XP Home Edition, Windows XP Professional x64 Edition, Windows Server 2003 プラットフォームメモ : visual スタイルは、これらのプラットフォームでのみサポートされます。
使用例ScrollBarRenderer メソッドを使用するカスタム コントロールを記述することによって、マウス クリックに応答するスクロール バーを描画する方法を、次のコード例に示します。
Imports System Imports System.Drawing Imports System.Windows.Forms Imports System.Windows.Forms.VisualStyles Namespace ScrollBarRendererSample Class Form1 Inherits Form Public Sub New() Me.Size = New Size(500, 500) Dim Bar1 As New CustomScrollBar() Bar1.Location = New Point(50, 100) Bar1.Size = New Size(200, 20) Controls.Add(Bar1) End Sub <STAThread()> _ Shared Sub Main() ' The call to EnableVisualStyles below does not affect whether ' ScrollBarRenderer.IsSupported is true; as long as visual styles ' are enabled by the operating system, IsSupported is true. Application.EnableVisualStyles() Application.Run(New Form1()) End Sub End Class Public Class CustomScrollBar Inherits Control Private clickedBarRectangle As Rectangle Private thumbRectangle As Rectangle Private leftArrowRectangle As Rectangle Private rightArrowRectangle As Rectangle Private leftArrowClicked As Boolean = False Private rightArrowClicked As Boolean = False Private leftBarClicked As Boolean = False Private rightBarClicked As Boolean = False Private thumbClicked As Boolean = False Private thumbState As ScrollBarState = ScrollBarState.Normal Private leftButtonState As ScrollBarArrowButtonState = _ ScrollBarArrowButtonState.LeftNormal Private rightButtonState As ScrollBarArrowButtonState = _ ScrollBarArrowButtonState.RightNormal ' This control does not allow these widths to be altered. Private thumbWidth As Integer = 15 Private arrowWidth As Integer = 17 ' Set the right limit of the thumb's right border. Private thumbRightLimitRight As Integer = 0 ' Set the right limit of the thumb's left border. Private thumbRightLimitLeft As Integer = 0 ' Set the left limit of thumb's left border. Private thumbLeftLimit As Integer = 0 ' Set the distance from the left edge of the thumb to the ' cursor tip. Private thumbPosition As Integer = 0 ' Set the distance from the left edge of the scroll bar track to ' the cursor tip. Private trackPosition As Integer = 0 ' This timer draws the moving thumb while the scroll arrows or ' track are pressed. Private WithEvents progressTimer As New Timer() Public Sub New() With Me .Location = New Point(10, 10) .Width = 200 .Height = 20 .DoubleBuffered = True End With SetUpScrollBar() progressTimer.Interval = 20 End Sub ' Calculate the sizes of the scroll bar elements. Private Sub SetUpScrollBar() clickedBarRectangle = Me.ClientRectangle thumbRectangle = New Rectangle(ClientRectangle.X + _ Me.ClientRectangle.Width / 2, Me.ClientRectangle.Y, _ thumbWidth, Me.ClientRectangle.Height) leftArrowRectangle = New Rectangle(Me.ClientRectangle.X, _ Me.ClientRectangle.Y, arrowWidth, Me.ClientRectangle.Height) rightArrowRectangle = New Rectangle(Me.ClientRectangle.Right - _ arrowWidth, Me.ClientRectangle.Y, arrowWidth, _ Me.ClientRectangle.Height) ' Set the default starting thumb position. thumbPosition = thumbWidth / 2 ' Set the right limit of the thumb's right border. thumbRightLimitRight = Me.ClientRectangle.Right - arrowWidth ' Set the right limit of the thumb's left border. thumbRightLimitLeft = thumbRightLimitRight - thumbWidth ' Set the left limit of the thumb's left border. thumbLeftLimit = Me.ClientRectangle.X + arrowWidth End Sub ' Draw the scroll bar in its normal state. Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs) MyBase.OnPaint(e) ' Visual styles are not enabled. If Not ScrollBarRenderer.IsSupported Then Me.Parent.Text = "CustomScrollBar Disabled" Return End If Me.Parent.Text = "CustomScrollBar Enabled" ' Draw the scroll bar track. ScrollBarRenderer.DrawRightHorizontalTrack(e.Graphics, _ Me.ClientRectangle, ScrollBarState.Normal) ' Draw the thumb and thumb grip in the current state. ScrollBarRenderer.DrawHorizontalThumb(e.Graphics, _ thumbRectangle, thumbState) ScrollBarRenderer.DrawHorizontalThumbGrip(e.Graphics, _ thumbRectangle, thumbState) ' Draw the scroll arrows in the current state. ScrollBarRenderer.DrawArrowButton(e.Graphics, _ leftArrowRectangle, leftButtonState) ScrollBarRenderer.DrawArrowButton(e.Graphics, _ rightArrowRectangle, rightButtonState) ' Draw a highlighted rectangle in the left side of the scroll ' bar track if the user has clicked between the left arrow ' and thumb. If leftBarClicked Then clickedBarRectangle.X = thumbLeftLimit clickedBarRectangle.Width = thumbRectangle.X - thumbLeftLimit ScrollBarRenderer.DrawLeftHorizontalTrack(e.Graphics, _ clickedBarRectangle, ScrollBarState.Pressed) ' Draw a highlighted rectangle in the right side of the scroll ' bar track if the user has clicked between the right arrow ' and thumb. ElseIf rightBarClicked Then clickedBarRectangle.X = thumbRectangle.X + _ thumbRectangle.Width clickedBarRectangle.Width = thumbRightLimitRight - _ clickedBarRectangle.X ScrollBarRenderer.DrawRightHorizontalTrack(e.Graphics, _ clickedBarRectangle, ScrollBarState.Pressed) End If End Sub ' Handle a mouse click in the scroll bar. Protected Overrides Sub OnMouseDown(ByVal e As MouseEventArgs) MyBase.OnMouseDown(e) If Not ScrollBarRenderer.IsSupported Then Return End If ' When the thumb is clicked, update the distance from the left ' edge of the thumb to the cursor tip. If thumbRectangle.Contains(e.Location) Then thumbClicked = True thumbPosition = e.Location.X - thumbRectangle.X thumbState = ScrollBarState.Pressed ' When the left arrow is clicked, start the timer to scroll ' while the arrow is held down. ElseIf leftArrowRectangle.Contains(e.Location) Then leftArrowClicked = True leftButtonState = ScrollBarArrowButtonState.LeftPressed progressTimer.Start() ' When the right arrow is clicked, start the timer to scroll ' while arrow is held down. ElseIf rightArrowRectangle.Contains(e.Location) Then rightArrowClicked = True rightButtonState = ScrollBarArrowButtonState.RightPressed progressTimer.Start() ' When the scroll bar is clicked, start the timer to move the ' thumb while the mouse is held down. Else trackPosition = e.Location.X If e.Location.X < Me.thumbRectangle.X Then leftBarClicked = True Else rightBarClicked = True End If progressTimer.Start() End If Invalidate() End Sub ' Draw the track. Protected Overrides Sub OnMouseUp(ByVal e As MouseEventArgs) MyBase.OnMouseUp(e) If Not ScrollBarRenderer.IsSupported Then Return End If ' Update the thumb position, if the new location is within ' the bounds. If thumbClicked Then thumbClicked = False thumbState = ScrollBarState.Normal If e.Location.X > thumbLeftLimit + thumbPosition And _ e.Location.X < thumbRightLimitLeft + thumbPosition Then thumbRectangle.X = e.Location.X - thumbPosition thumbClicked = False End If ' If one of the four thumb movement areas was clicked, ' stop the timer. ElseIf leftArrowClicked Then leftArrowClicked = False leftButtonState = ScrollBarArrowButtonState.LeftNormal progressTimer.Stop() ElseIf rightArrowClicked Then rightArrowClicked = False rightButtonState = ScrollBarArrowButtonState.RightNormal progressTimer.Stop() ElseIf leftBarClicked Then leftBarClicked = False progressTimer.Stop() ElseIf rightBarClicked Then rightBarClicked = False progressTimer.Stop() End If Invalidate() End Sub ' Track mouse movements if the user clicks on the scroll bar thumb. Protected Overrides Sub OnMouseMove(ByVal e As MouseEventArgs) MyBase.OnMouseMove(e) If Not ScrollBarRenderer.IsSupported Then Return End If ' Update the thumb position, if the new location is ' within the bounds. If thumbClicked Then ' The thumb is all the way to the left. If e.Location.X <= thumbLeftLimit + thumbPosition Then thumbRectangle.X = thumbLeftLimit ' The thumb is all the way to the right. ElseIf e.Location.X >= thumbRightLimitLeft + thumbPosition Then thumbRectangle.X = thumbRightLimitLeft ' The thumb is between the ends of the track. Else thumbRectangle.X = e.Location.X - thumbPosition End If Invalidate() End If End Sub ' Recalculate the sizes of the scroll bar elements. Protected Overrides Sub OnSizeChanged(ByVal e As EventArgs) MyBase.OnSizeChanged(e) SetUpScrollBar() End Sub ' Handle the timer tick by updating the thumb position. Private Sub progressTimer_Tick(ByVal sender As Object, _ ByVal myEventArgs As EventArgs) Handles progressTimer.Tick If Not ScrollBarRenderer.IsSupported Then Return End If ' If an arrow is clicked, move the thumb in small increments. If rightArrowClicked And thumbRectangle.X < thumbRightLimitLeft Then thumbRectangle.X += 1 ElseIf leftArrowClicked And thumbRectangle.X > thumbLeftLimit Then thumbRectangle.X -= 1 ' If the track bar to right of the thumb is clicked, move the ' thumb to the right in larger increments until the right edge ' of the thumb hits the cursor. ElseIf rightBarClicked And thumbRectangle.X < thumbRightLimitLeft _ And thumbRectangle.X + thumbRectangle.Width < trackPosition Then thumbRectangle.X += 3 ' If the track bar to left of the thumb is clicked, move the ' thumb to the left in larger increments until the left edge ' of the thumb hits the cursor. ElseIf leftBarClicked And thumbRectangle.X > thumbLeftLimit And _ thumbRectangle.X > trackPosition Then thumbRectangle.X -= 3 End If Invalidate() End Sub End Class End Namespace
using System; using System.Drawing; using System.Windows.Forms; using System.Windows.Forms.VisualStyles; namespace ScrollBarRendererSample { class Form1 : Form { public Form1() : base() { this.Size = new Size(500, 500); CustomScrollBar Bar1 = new CustomScrollBar(); Bar1.Location = new Point(50, 100); Bar1.Size = new Size(200, 20); Controls.Add(Bar1); } [STAThread] static void Main() { // The call to EnableVisualStyles below does not affect whether // ScrollBarRenderer.IsSupported is true; as long as visual styles // are enabled by the operating system, IsSupported is true. Application.EnableVisualStyles(); Application.Run(new Form1()); } } public class CustomScrollBar : Control { private Rectangle clickedBarRectangle; private Rectangle thumbRectangle; private Rectangle leftArrowRectangle; private Rectangle rightArrowRectangle; private bool leftArrowClicked = false; private bool rightArrowClicked = false; private bool leftBarClicked = false; private bool rightBarClicked = false; private bool thumbClicked = false; private ScrollBarState thumbState = ScrollBarState.Normal; private ScrollBarArrowButtonState leftButtonState = ScrollBarArrowButtonState.LeftNormal; private ScrollBarArrowButtonState rightButtonState = ScrollBarArrowButtonState.RightNormal; // This control does not allow these widths to be altered. private int thumbWidth = 15; private int arrowWidth = 17; // Set the right limit of the thumb's right border. private int thumbRightLimitRight = 0; // Set the right limit of the thumb's left border. private int thumbRightLimitLeft = 0; // Set the left limit of thumb's left border. private int thumbLeftLimit = 0; // Set the distance from the left edge of the thumb to the // cursor tip. private int thumbPosition = 0; // Set the distance from the left edge of the scroll bar track // to the cursor tip. private int trackPosition = 0; // This timer draws the moving thumb while the scroll arrows or // track are pressed. private Timer progressTimer = new Timer(); public CustomScrollBar() : base() { this.Location = new Point(10, 10); this.Width = 200; this.Height = 20; this.DoubleBuffered = true; SetUpScrollBar(); progressTimer.Interval = 20; progressTimer.Tick += new EventHandler(progressTimer_Tick); } // Calculate the sizes of the scroll bar elements. private void SetUpScrollBar() { clickedBarRectangle = ClientRectangle; thumbRectangle = new Rectangle( ClientRectangle.X + ClientRectangle.Width / 2, ClientRectangle.Y, thumbWidth, ClientRectangle.Height); leftArrowRectangle = new Rectangle( ClientRectangle.X, ClientRectangle.Y, arrowWidth, ClientRectangle.Height); rightArrowRectangle = new Rectangle( ClientRectangle.Right - arrowWidth, ClientRectangle.Y, arrowWidth, ClientRectangle.Height); // Set the default starting thumb position. thumbPosition = thumbWidth / 2; // Set the right limit of the thumb's right border. thumbRightLimitRight = ClientRectangle.Right - arrowWidth; // Set the right limit of the thumb's left border. thumbRightLimitLeft = thumbRightLimitRight - thumbWidth; // Set the left limit of the thumb's left border. thumbLeftLimit = ClientRectangle.X + arrowWidth; } // Draw the scroll bar in its normal state. protected override void OnPaint(PaintEventArgs e) { base.OnPaint(e); // Visual styles are not enabled. if (!ScrollBarRenderer.IsSupported) { this.Parent.Text = "CustomScrollBar Disabled"; return; } this.Parent.Text = "CustomScrollBar Enabled"; // Draw the scroll bar track. ScrollBarRenderer.DrawRightHorizontalTrack(e.Graphics, ClientRectangle, ScrollBarState.Normal); // Draw the thumb and thumb grip in the current state. ScrollBarRenderer.DrawHorizontalThumb(e.Graphics, thumbRectangle, thumbState); ScrollBarRenderer.DrawHorizontalThumbGrip(e.Graphics, thumbRectangle, thumbState); // Draw the scroll arrows in the current state. ScrollBarRenderer.DrawArrowButton(e.Graphics, leftArrowRectangle, leftButtonState); ScrollBarRenderer.DrawArrowButton(e.Graphics, rightArrowRectangle, rightButtonState); // Draw a highlighted rectangle in the left side of the scroll // bar track if the user has clicked between the left arrow // and thumb. if (leftBarClicked) { clickedBarRectangle.X = thumbLeftLimit; clickedBarRectangle.Width = thumbRectangle.X - thumbLeftLimit; ScrollBarRenderer.DrawLeftHorizontalTrack(e.Graphics, clickedBarRectangle, ScrollBarState.Pressed); } // Draw a highlighted rectangle in the right side of the scroll // bar track if the user has clicked between the right arrow // and thumb. else if (rightBarClicked) { clickedBarRectangle.X = thumbRectangle.X + thumbRectangle.Width; clickedBarRectangle.Width = thumbRightLimitRight - clickedBarRectangle.X; ScrollBarRenderer.DrawRightHorizontalTrack(e.Graphics, clickedBarRectangle, ScrollBarState.Pressed); } } // Handle a mouse click in the scroll bar. protected override void OnMouseDown(MouseEventArgs e) { base.OnMouseDown(e); if (!ScrollBarRenderer.IsSupported) return; // When the thumb is clicked, update the distance from the left // edge of the thumb to the cursor tip. if (thumbRectangle.Contains(e.Location)) { thumbClicked = true; thumbPosition = e.Location.X - thumbRectangle.X; thumbState = ScrollBarState.Pressed; } // When the left arrow is clicked, start the timer to scroll // while the arrow is held down. else if (leftArrowRectangle.Contains(e.Location)) { leftArrowClicked = true; leftButtonState = ScrollBarArrowButtonState.LeftPressed; progressTimer.Start(); } // When the right arrow is clicked, start the timer to scroll // while the arrow is held down. else if (rightArrowRectangle.Contains(e.Location)) { rightArrowClicked = true; rightButtonState = ScrollBarArrowButtonState.RightPressed; progressTimer.Start(); } // When the scroll bar is clicked, start the timer to move the // thumb while the mouse is held down. else { trackPosition = e.Location.X; if (e.Location.X < this.thumbRectangle.X) { leftBarClicked = true; } else { rightBarClicked = true; } progressTimer.Start(); } Invalidate(); } // Draw the track. protected override void OnMouseUp(MouseEventArgs e) { base.OnMouseUp(e); if (!ScrollBarRenderer.IsSupported) return; // Update the thumb position, if the new location is within // the bounds. if (thumbClicked) { thumbClicked = false; thumbState = ScrollBarState.Normal; if (e.Location.X > (thumbLeftLimit + thumbPosition) && e.Location.X < (thumbRightLimitLeft + thumbPosition)) { thumbRectangle.X = e.Location.X - thumbPosition; thumbClicked = false; } } // If one of the four thumb movement areas was clicked, // stop the timer. else if (leftArrowClicked) { leftArrowClicked = false; leftButtonState = ScrollBarArrowButtonState.LeftNormal; progressTimer.Stop(); } else if (rightArrowClicked) { rightArrowClicked = false; rightButtonState = ScrollBarArrowButtonState.RightNormal; progressTimer.Stop(); } else if (leftBarClicked) { leftBarClicked = false; progressTimer.Stop(); } else if (rightBarClicked) { rightBarClicked = false; progressTimer.Stop(); } Invalidate(); } // Track mouse movements if the user clicks on the scroll bar thumb. protected override void OnMouseMove(MouseEventArgs e) { base.OnMouseMove(e); if (!ScrollBarRenderer.IsSupported) return; // Update the thumb position, if the new location is // within the bounds. if (thumbClicked) { // The thumb is all the way to the left. if (e.Location.X <= (thumbLeftLimit + thumbPosition)) { thumbRectangle.X = thumbLeftLimit; } // The thumb is all the way to the right. else if (e.Location.X >= (thumbRightLimitLeft + thumbPosition)) { thumbRectangle.X = thumbRightLimitLeft; } // The thumb is between the ends of the track. else { thumbRectangle.X = e.Location.X - thumbPosition; } Invalidate(); } } // Recalculate the sizes of the scroll bar elements. protected override void OnSizeChanged(EventArgs e) { base.OnSizeChanged(e); SetUpScrollBar(); } // Handle the timer tick by updating the thumb position. private void progressTimer_Tick(object sender, EventArgs myEventArgs) { if (!ScrollBarRenderer.IsSupported) return; // If an arrow is clicked, move the thumb in small increments. if (rightArrowClicked && thumbRectangle.X < thumbRightLimitLeft) { thumbRectangle.X++; } else if (leftArrowClicked && thumbRectangle.X > thumbLeftLimit) { thumbRectangle.X--; } // If the track bar to right of the thumb is clicked, move the // thumb to the right in larger increments until the right edge // of the thumb hits the cursor. else if (rightBarClicked && thumbRectangle.X < thumbRightLimitLeft && thumbRectangle.X + thumbRectangle.Width < trackPosition) { thumbRectangle.X += 3; } // If the track bar to left of the thumb is clicked, move the // thumb to the left in larger increments until the left edge // of the thumb hits the cursor. else if (leftBarClicked && thumbRectangle.X > thumbLeftLimit && thumbRectangle.X > trackPosition) { thumbRectangle.X -= 3; } Invalidate(); } } }
#using <System.Drawing.dll> #using <System.Windows.Forms.dll> #using <System.dll> using namespace System; using namespace System::Drawing; using namespace System::Windows::Forms; using namespace System::Windows::Forms::VisualStyles; namespace ScrollBarRendererSample { public ref class CustomScrollBar : public Control { private: Rectangle clickedBarRectangle; private: Rectangle thumbRectangle; private: Rectangle leftArrowRectangle; private: Rectangle rightArrowRectangle; private: bool leftArrowClicked; private: bool rightArrowClicked; private: bool leftBarClicked; private: bool rightBarClicked; private: bool thumbClicked; private: ScrollBarState thumbState; private: ScrollBarArrowButtonState leftButtonState; private: ScrollBarArrowButtonState rightButtonState; private: int thumbWidth; private: int arrowWidth; // The right limit of the thumb's right border. private: int thumbRightLimitRight; // The right limit of the thumb's left border. private: int thumbRightLimitLeft; // The left limit of thumb's left border. private: int thumbLeftLimit; // The distance from the left edge of the thumb to the // cursor tip. private: int thumbPosition; // The distance from the left edge of the scroll bar track // to the cursor tip. private: int trackPosition; // This timer draws the moving thumb while the scroll arrows or // track are pressed. private: Timer^ progressTimer; public: CustomScrollBar() : Control() { thumbState = ScrollBarState::Normal; leftButtonState = ScrollBarArrowButtonState::LeftNormal; rightButtonState = ScrollBarArrowButtonState::RightNormal; // This control does not allow these widths to be altered. thumbWidth = 15; arrowWidth = 17; progressTimer = gcnew Timer(); this->Location = Point(10, 10); this->Width = 200; this->Height = 20; this->DoubleBuffered = true; SetUpScrollBar(); progressTimer->Interval = 20; progressTimer->Tick += gcnew EventHandler(this, &CustomScrollBar::progressTimer_Tick); } // Calculate the sizes of the scroll bar elements. private: void SetUpScrollBar() { clickedBarRectangle = ClientRectangle; thumbRectangle = Rectangle( ClientRectangle.X + ClientRectangle.Width / 2, ClientRectangle.Y, thumbWidth, ClientRectangle.Height); leftArrowRectangle = Rectangle( ClientRectangle.X, ClientRectangle.Y, arrowWidth, ClientRectangle.Height); rightArrowRectangle = Rectangle( ClientRectangle.Right - arrowWidth, ClientRectangle.Y, arrowWidth, ClientRectangle.Height); // Set the default starting thumb position. thumbPosition = thumbWidth / 2; // Set the right limit of the thumb's right border. thumbRightLimitRight = ClientRectangle.Right - arrowWidth; // Set the right limit of the thumb's left border. thumbRightLimitLeft = thumbRightLimitRight - thumbWidth; // Set the left limit of the thumb's left border. thumbLeftLimit = ClientRectangle.X + arrowWidth; } // Draw the scroll bar in its normal state. protected: virtual void OnPaint(PaintEventArgs^ e) override { __super::OnPaint(e); // Visual styles are not enabled. if (!ScrollBarRenderer::IsSupported) { this->Parent->Text = "CustomScrollBar Disabled"; return; } this->Parent->Text = "CustomScrollBar Enabled"; // Draw the scroll bar track. ScrollBarRenderer::DrawRightHorizontalTrack(e->Graphics, ClientRectangle, ScrollBarState::Normal); // Draw the thumb and thumb grip in the current state. ScrollBarRenderer::DrawHorizontalThumb(e->Graphics, thumbRectangle, thumbState); ScrollBarRenderer::DrawHorizontalThumbGrip(e->Graphics, thumbRectangle, thumbState); // Draw the scroll arrows in the current state. ScrollBarRenderer::DrawArrowButton(e->Graphics, leftArrowRectangle, leftButtonState); ScrollBarRenderer::DrawArrowButton(e->Graphics, rightArrowRectangle, rightButtonState); // Draw a highlighted rectangle in the left side of the scroll // bar track if the user has clicked between the left arrow // and thumb. if (leftBarClicked) { clickedBarRectangle.X = thumbLeftLimit; clickedBarRectangle.Width = thumbRectangle.X - thumbLeftLimit; ScrollBarRenderer::DrawLeftHorizontalTrack(e->Graphics, clickedBarRectangle, ScrollBarState::Pressed); } // Draw a highlighted rectangle in the right side of the scroll // bar track if the user has clicked between the right arrow // and thumb. else if (rightBarClicked) { clickedBarRectangle.X = thumbRectangle.X + thumbRectangle.Width; clickedBarRectangle.Width = thumbRightLimitRight - clickedBarRectangle.X; ScrollBarRenderer::DrawRightHorizontalTrack(e->Graphics, clickedBarRectangle, ScrollBarState::Pressed); } } // Handle a mouse click in the scroll bar. protected: virtual void OnMouseDown(MouseEventArgs^ e) override { __super::OnMouseDown(e); if (!ScrollBarRenderer::IsSupported) { return; } // When the thumb is clicked, update the distance from the left // edge of the thumb to the cursor tip. if (thumbRectangle.Contains(e->Location)) { thumbClicked = true; thumbPosition = e->Location.X - thumbRectangle.X; thumbState = ScrollBarState::Pressed; } // When the left arrow is clicked, start the timer to scroll // while the arrow is held down. else if (leftArrowRectangle.Contains(e->Location)) { leftArrowClicked = true; leftButtonState = ScrollBarArrowButtonState::LeftPressed; progressTimer->Start(); } // When the right arrow is clicked, start the timer to scroll // while the arrow is held down. else if (rightArrowRectangle.Contains(e->Location)) { rightArrowClicked = true; rightButtonState = ScrollBarArrowButtonState::RightPressed; progressTimer->Start(); } // When the scroll bar is clicked, start the timer to move the // thumb while the mouse is held down. else { trackPosition = e->Location.X; if (e->Location.X < this->thumbRectangle.X) { leftBarClicked = true; } else { rightBarClicked = true; } progressTimer->Start(); } Invalidate(); } // Draw the track. protected: virtual void OnMouseUp(MouseEventArgs^ e) override { __super::OnMouseUp(e); if (!ScrollBarRenderer::IsSupported) { return; } // Update the thumb position, if the new location is within // the bounds. if (thumbClicked) { thumbClicked = false; thumbState = ScrollBarState::Normal; if (e->Location.X > (thumbLeftLimit + thumbPosition) && e->Location.X < (thumbRightLimitLeft + thumbPosition)) { thumbRectangle.X = e->Location.X - thumbPosition; } } // If one of the four thumb movement areas was clicked, // stop the timer. else if (leftArrowClicked) { leftArrowClicked = false; leftButtonState = ScrollBarArrowButtonState::LeftNormal; progressTimer->Stop(); } else if (rightArrowClicked) { rightArrowClicked = false; rightButtonState = ScrollBarArrowButtonState::RightNormal; progressTimer->Stop(); } else if (leftBarClicked) { leftBarClicked = false; progressTimer->Stop(); } else if (rightBarClicked) { rightBarClicked = false; progressTimer->Stop(); } Invalidate(); } // Track mouse movements if the user clicks on the scroll bar thumb. protected: virtual void OnMouseMove(MouseEventArgs^ e) override { __super::OnMouseMove(e); if (!ScrollBarRenderer::IsSupported) { return; } // Update the thumb position, if the new location is // within the bounds. if (thumbClicked) { // The thumb is all the way to the left. if (e->Location.X <= (thumbLeftLimit + thumbPosition)) { thumbRectangle.X = thumbLeftLimit; } // The thumb is all the way to the right. else if (e->Location.X >= (thumbRightLimitLeft + thumbPosition)) { thumbRectangle.X = thumbRightLimitLeft; } // The thumb is between the ends of the track. else { thumbRectangle.X = e->Location.X - thumbPosition; } Invalidate(); } } // Recalculate the sizes of the scroll bar elements. protected: virtual void OnSizeChanged(EventArgs^ e) override { __super::OnSizeChanged(e); SetUpScrollBar(); } // Handle the timer tick by updating the thumb position. private: void progressTimer_Tick(Object^ sender, EventArgs^ myEventArgs) { if (!ScrollBarRenderer::IsSupported) { return; } // If an arrow is clicked, move the thumb in small increments. if (rightArrowClicked && thumbRectangle.X < thumbRightLimitLeft) { thumbRectangle.X++; } else if (leftArrowClicked && thumbRectangle.X > thumbLeftLimit) { thumbRectangle.X--; } // If the track bar to right of the thumb is clicked, move the // thumb to the right in larger increments until the right edge // of the thumb hits the cursor. else if (rightBarClicked && thumbRectangle.X < thumbRightLimitLeft && thumbRectangle.X + thumbRectangle.Width < trackPosition) { thumbRectangle.X += 3; } // If the track bar to left of the thumb is clicked, move the // thumb to the left in larger increments until the left edge // of the thumb hits the cursor. else if (leftBarClicked && thumbRectangle.X > thumbLeftLimit && thumbRectangle.X > trackPosition) { thumbRectangle.X -= 3; } Invalidate(); } }; public ref class Form1 : public Form { public: Form1() : Form() { this->Size = System::Drawing::Size(500, 500); CustomScrollBar^ sampleCustomScrollBar = gcnew CustomScrollBar(); sampleCustomScrollBar->Location = Point(50, 100); sampleCustomScrollBar->Size = System::Drawing::Size(200, 20); Controls->Add(sampleCustomScrollBar); } }; } [STAThread] int main() { // The call to EnableVisualStyles below does not affect whether // ScrollBarRenderer.IsSupported is true; as long as visual styles // are enabled by the operating system, IsSupported is true. Application::EnableVisualStyles(); Application::Run(gcnew ScrollBarRendererSample::Form1()); }
継承階層 System.Object
System.Windows.Forms.ScrollBarRenderer
System.Windows.Forms.ScrollBarRenderer
スレッド セーフプラットフォームWindows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。
バージョン情報参照 関連項目
ScrollBarRenderer メンバ
System.Windows.Forms 名前空間
System.Windows.Forms.VisualStyles.VisualStyleRenderer
System.Windows.Forms.VisualStyles.VisualStyleElement
ScrollBarRenderer メンバ
System.Windows.Forms 名前空間
System.Windows.Forms.VisualStyles.VisualStyleRenderer
System.Windows.Forms.VisualStyles.VisualStyleElement
ScrollBarRenderer プロパティ
パブリック プロパティ.gif)
参照関連項目
ScrollBarRenderer クラスSystem.Windows.Forms 名前空間
System.Windows.Forms.VisualStyles.VisualStyleRenderer
System.Windows.Forms.VisualStyles.VisualStyleElement
ScrollBarRenderer メソッド
パブリック メソッド ( プロテクト メソッド も参照)
.gif)
プロテクト メソッド| 名前 | 説明 | |
|---|---|---|
.gif) | Finalize | Object がガベージ コレクションにより収集される前に、その Object がリソースを解放し、その他のクリーンアップ操作を実行できるようにします。 ( Object から継承されます。) |
| | MemberwiseClone | 現在の Object の簡易コピーを作成します。 ( Object から継承されます。) |
参照関連項目
ScrollBarRenderer クラスSystem.Windows.Forms 名前空間
System.Windows.Forms.VisualStyles.VisualStyleRenderer
System.Windows.Forms.VisualStyles.VisualStyleElement
ScrollBarRenderer メンバ
visual スタイルを使用してスクロール バー コントロールを描画するメソッドを用意します。このクラスは継承できません。
ScrollBarRenderer データ型で公開されるメンバを以下の表に示します。
パブリック プロパティパブリック メソッド ( プロテクト メソッド も参照)
プロテクト メソッド| 名前 | 説明 | |
|---|---|---|
| | Finalize | Object がガベージ コレクションにより収集される前に、その Object がリソースを解放し、その他のクリーンアップ操作を実行できるようにします。 (Object から継承されます。) |
| | MemberwiseClone | 現在の Object の簡易コピーを作成します。 (Object から継承されます。) |
参照関連項目
ScrollBarRenderer クラスSystem.Windows.Forms 名前空間
System.Windows.Forms.VisualStyles.VisualStyleRenderer
System.Windows.Forms.VisualStyles.VisualStyleElement
- ScrollBarRendererのページへのリンク
