VisualStyleElement クラス
定義
重要
一部の情報は、リリース前に大きく変更される可能性があるプレリリースされた製品に関するものです。 Microsoft は、ここに記載されている情報について、明示または黙示を問わず、一切保証しません。
visual スタイルで描画するコントロール要素またはユーザー インターフェイス (UI) 要素を示します。
public ref class VisualStyleElementpublic class VisualStyleElementtype VisualStyleElement = classPublic Class VisualStyleElement- 継承
-
VisualStyleElement
例
次のコード例は、名前空間によってSystem.Windows.Forms.VisualStyles公開されるすべてのオブジェクトを参照および描画するための UI を提供するVisualStyleElement完全なアプリケーションです。 要素を表示するには、ウィンドウの左側にある コントロールを使用 ListView して、描画する要素の状態を表すノードに移動し、ノードをクリックします。 このサンプルでは、要素が現在のビジュアル スタイルで定義されている場合にのみ、選択した要素を描画します。
#using <System.Drawing.dll>
#using <System.Windows.Forms.dll>
#using <System.dll>
using namespace System;
using namespace System::Text;
using namespace System::Drawing;
using namespace System::Collections::Generic;
using namespace System::Reflection;
using namespace System::Windows::Forms;
using namespace System::Windows::Forms::VisualStyles;
namespace VisualStyleElementViewer
{
public ref class ElementViewer : public UserControl
{
private:
VisualStyleElement^ element;
VisualStyleRenderer^ renderer;
Dictionary<String^, VisualStyleElement^>^ elementDictionary;
Rectangle descriptionRect;
Rectangle displayRect;
Rectangle displayRectFull;
System::Drawing::Size currentTrueSize;
StringBuilder^ elementDescription;
Label^ infoLabel;
TreeView^ treeView;
DomainUpDown^ domainUpDown;
bool drawElement;
public:
ElementViewer():UserControl()
{
elementDictionary =
gcnew Dictionary<String^, VisualStyleElement^>();
currentTrueSize = System::Drawing::Size();
elementDescription = gcnew StringBuilder();
infoLabel = gcnew Label();
treeView = gcnew TreeView();
domainUpDown = gcnew DomainUpDown();
this->Location = Point(10, 10);
this->Size = System::Drawing::Size(650, 500);
this->Text = "VisualStyleElement Viewer";
this->Font = SystemFonts::IconTitleFont;
this->BackColor = Color::White;
this->BorderStyle = System::Windows::Forms::BorderStyle::Fixed3D;
this->AutoSize = true;
this->Load += gcnew EventHandler(this,
&ElementViewer::ElementViewer_Load);
}
private:
void ElementViewer_Load(Object^ sender, EventArgs^ e)
{
// Make sure the visual styles are enabled before
// going any further.
if (!Application::RenderWithVisualStyles)
{
return;
}
infoLabel->Location = Point(320, 10);
infoLabel->Size = System::Drawing::Size(300, 60);
infoLabel->Text = "Expand the element class nodes " +
"in the tree view to access visual style elements. " +
"Click an element name to draw the element below. To " +
"change the size of a resizable element, use the " +
"spin control.";
domainUpDown->Location = Point(320, 80);
domainUpDown->Size = System::Drawing::Size(70, 30);
domainUpDown->ReadOnly = true;
domainUpDown->Items->Add(elementSizes::Large);
domainUpDown->Items->Add(elementSizes::Medium);
domainUpDown->Items->Add(elementSizes::TrueSize);
domainUpDown->SelectedIndex = 2;
domainUpDown->SelectedItemChanged +=
gcnew EventHandler(this,
&ElementViewer::DomainUpDown_SelectedItemChanged);
domainUpDown->DownButton();
descriptionRect = Rectangle(320, 120, 250, 50);
displayRect = Rectangle(320, 160, 0, 0);
displayRectFull = Rectangle(320, 160, 300, 200);
// Initialize the element and renderer to known good values.
element = VisualStyleElement::Button::PushButton::Normal;
renderer = gcnew VisualStyleRenderer(element);
SetupElementCollection();
SetupTreeView();
this->Controls->AddRange(gcnew array<Control^>{treeView,
domainUpDown, infoLabel });
}
// Use reflection to build a Dictionary of all
// VisualStyleElement objects exposed in the
// System.Windows.Forms.VisualStyles namespace.
private:
void SetupElementCollection()
{
StringBuilder^ elementName = gcnew StringBuilder();
VisualStyleElement^ currentElement;
int plusSignIndex = 0;
// Get array of first-level nested types within
// VisualStyleElement; these are the element classes.
array<Type^>^ elementClasses =
VisualStyleElement::typeid->GetNestedTypes();
for each (Type^ elementClass in elementClasses)
{
// Get an array of second-level nested types within
// VisualStyleElement; these are the element parts.
array<Type^>^ elementParts = elementClass->GetNestedTypes();
// Get the index of the first '+' character in
// the full element class name.
plusSignIndex = elementClass->FullName->IndexOf('+');
for each (Type^ elementPart in elementParts)
{
// Get an array of static property details
// for the current type. Each of these types have
// properties that return VisualStyleElement objects.
array<PropertyInfo^>^ elementProperties =
elementPart->GetProperties(BindingFlags::Static |
BindingFlags::Public);
// For each property, insert the unique full element
// name and the element into the collection.
for each(PropertyInfo^ elementProperty in
elementProperties)
{
// Get the element.
currentElement =
(VisualStyleElement^)elementProperty->
GetValue(nullptr, BindingFlags::Static, nullptr,
nullptr, nullptr);
// Append the full element name.
elementName->Append(elementClass->FullName,
plusSignIndex + 1,
elementClass->FullName->Length -
plusSignIndex - 1);
elementName->Append("." +
elementPart->Name + "." +
elementProperty->Name);
// Add the element and element name to
// the Dictionary.
elementDictionary->Add(elementName->ToString(),
currentElement);
// Clear the element name for the
// next iteration.
elementName->Remove(0, elementName->Length);
}
}
}
}
// Initialize the tree view with the element names.
private:
void SetupTreeView()
{
treeView->Location = Point(10, 10);
treeView->Size = System::Drawing::Size(300, 450);
// treeView->BorderStyle = BorderStyle.FixedSingle;
treeView->BackColor = Color::WhiteSmoke;
treeView->SelectedNode = nullptr;
treeView->AfterSelect +=
gcnew TreeViewEventHandler(this,
&ElementViewer::TreeView_AfterSelect);
treeView->BeginUpdate();
// An index into the top-level tree nodes.
int nodeIndex = 0;
// An index into the first '.' character in an element name.
int firstDotIndex = 0;
// Initialize the element class name to compare
// with the class name of the first element
// in the Dictionary, and set this name to the first
// top-level node.
StringBuilder^ compareClassName =
gcnew StringBuilder("Button");
treeView->Nodes->Add(
gcnew TreeNode(compareClassName->ToString()));
// The current element class name.
StringBuilder^ currentClassName = gcnew StringBuilder();
// The text for each second-level node.
StringBuilder^ nodeText = gcnew StringBuilder();
for each(KeyValuePair<String^, VisualStyleElement^>^ entry
in elementDictionary)
{
// Isolate the class name of the current element.
firstDotIndex = entry->Key->IndexOf('.');
currentClassName->Append(entry->Key, 0, firstDotIndex);
// Determine whether we need to increment to the next
// element class.
if (currentClassName->ToString() !=
compareClassName->ToString())
{
// Increment the index to the next top-level node
// in the tree view.
nodeIndex++;
// Get the new class name to compare with.
compareClassName->Remove(0, compareClassName->Length);
compareClassName->Append(entry->Key);
compareClassName->Remove(firstDotIndex,
compareClassName->Length - firstDotIndex);
// Add a new top-level node to the tree view.
treeView->Nodes->Add(
gcnew TreeNode(compareClassName->ToString()));
}
// Get the text for the new second-level node.
nodeText->Append(entry->Key, firstDotIndex + 1,
entry->Key->Length - firstDotIndex - 1);
// Create and insert the new second-level node.
TreeNode^ newNode = gcnew TreeNode(nodeText->ToString());
newNode->Name = entry->Key;
treeView->Nodes[nodeIndex]->Nodes->Add(newNode);
currentClassName->Remove(0, currentClassName->Length);
nodeText->Remove(0, nodeText->Length);
}
treeView->EndUpdate();
}
protected:
virtual void OnPaint(PaintEventArgs^ e) override
{
__super::OnPaint(e);
// Do nothing further if visual styles are disabled.
if (!Application::RenderWithVisualStyles)
{
this->Text = "Visual styles are disabled.";
TextRenderer::DrawText(e->Graphics, this->Text, this->Font,
this->Location, this->ForeColor);
return;
}
// Draw the element description.
TextRenderer::DrawText(e->Graphics, elementDescription->ToString(),
this->Font, descriptionRect, this->ForeColor,
TextFormatFlags::WordBreak);
// Draw the element, if an element is selected.
if (drawElement)
{
renderer->DrawBackground(e->Graphics, this->displayRect);
}
}
// Set the element to draw.
private:
void TreeView_AfterSelect(Object^ sender, TreeViewEventArgs^ e)
{
// Clear the element description.
elementDescription->Remove(0, elementDescription->Length);
// If the user clicked a first-level node, disable drawing.
if (e->Node->Nodes->Count > 0)
{
drawElement = false;
elementDescription->Append("No element is selected");
domainUpDown->Enabled = false;
}
// The user clicked an element node.
else
{
// Add the element name to the description.
elementDescription->Append(e->Node->Text);
// Get the element that corresponds to the selected
// node's name.
String^ key = e->Node->Name;
element = elementDictionary[key];
// Disable resizing if the element is not defined.
if (!VisualStyleRenderer::IsElementDefined(element))
{
drawElement = false;
elementDescription->Append(" is not defined.");
domainUpDown->Enabled = false;
}
else
{
// Set the element to the renderer.
drawElement = true;
renderer->SetParameters(element);
elementDescription->Append(" is defined.");
// Get the system-defined size of the element.
Graphics^ g = this->CreateGraphics();
currentTrueSize = renderer->GetPartSize(g,
ThemeSizeType::True);
delete g;
displayRect.Size = currentTrueSize;
domainUpDown->Enabled = true;
domainUpDown->SelectedIndex = 2;
}
}
Invalidate();
}
// Resize the element display area.
private:
void DomainUpDown_SelectedItemChanged(Object^ sender,
EventArgs^ e)
{
switch ((int)domainUpDown->SelectedItem)
{
case this->elementSizes::TrueSize:
displayRect.Size = currentTrueSize;
break;
case this->elementSizes::Medium:
displayRect.Size =
System::Drawing::Size(displayRectFull.Width / 2,
displayRectFull.Height / 2);
break;
case this->elementSizes::Large:
displayRect.Size = displayRectFull.Size;
break;
}
Invalidate();
}
// These values represent the options in the UpDown control.
private:
enum class elementSizes
{
TrueSize,
Medium,
Large
};
};
public ref class ElementViewerForm : public Form
{
public:
ElementViewerForm()
{
ElementViewer^ elementViewer = gcnew ElementViewer();
this->Controls->Add(elementViewer);
this->Text = elementViewer->Text;
this->Size = System::Drawing::Size(700, 550);
}
};
}
using namespace VisualStyleElementViewer;
[STAThread]
int main()
{
Application::EnableVisualStyles();
Application::Run(gcnew ElementViewerForm());
}
using System;
using System.Text;
using System.Drawing;
using System.Collections.Generic;
using System.Reflection;
using System.Windows.Forms;
using System.Windows.Forms.VisualStyles;
namespace VisualStyleElementViewer
{
class Form1 : Form
{
public Form1()
{
ElementViewer ElementViewer1 = new ElementViewer();
this.Controls.Add(ElementViewer1);
this.Text = ElementViewer1.Text;
this.Size = new Size(700, 550);
}
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.Run(new Form1());
}
}
public class ElementViewer : UserControl
{
private VisualStyleElement element;
private VisualStyleRenderer renderer;
private Dictionary<string, VisualStyleElement> elementDictionary =
new Dictionary<string, VisualStyleElement>();
private Rectangle descriptionRect;
private Rectangle displayRect;
private Rectangle displayRectFull;
private Size currentTrueSize = new Size();
private StringBuilder elementDescription = new StringBuilder();
private Label label1 = new Label();
private TreeView treeView1 = new TreeView();
private DomainUpDown domainUpDown1 = new DomainUpDown();
private bool drawElement = false;
public ElementViewer()
: base()
{
this.Location = new Point(10, 10);
this.Size = new Size(650, 500);
this.Text = "VisualStyleElement Viewer";
this.Font = SystemFonts.IconTitleFont;
this.BackColor = Color.White;
this.BorderStyle = BorderStyle.Fixed3D;
this.AutoSize = true;
this.Load += new EventHandler(ElementViewer_Load);
}
void ElementViewer_Load(object sender, EventArgs e)
{
// Make sure the visual styles are enabled before
// going any further.
if (!Application.RenderWithVisualStyles)
{
return;
}
label1.Location = new Point(320, 10);
label1.Size = new Size(300, 60);
label1.Text = "Expand the element class nodes " +
"in the tree view to access visual style elements. " +
"Click an element name to draw the element below. To " +
"change the size of a resizable element, use the " +
"spin control.";
domainUpDown1.Location = new Point(320, 80);
domainUpDown1.Size = new Size(70, 30);
domainUpDown1.ReadOnly = true;
domainUpDown1.Items.Add(elementSizes.Large);
domainUpDown1.Items.Add(elementSizes.Medium);
domainUpDown1.Items.Add(elementSizes.TrueSize);
domainUpDown1.SelectedIndex = 2;
domainUpDown1.SelectedItemChanged +=
new EventHandler(domainUpDown1_SelectedItemChanged);
domainUpDown1.DownButton();
descriptionRect = new Rectangle(320, 120, 250, 50);
displayRect = new Rectangle(320, 160, 0, 0);
displayRectFull = new Rectangle(320, 160, 300, 200);
// Initialize the element and renderer to known good values.
element = VisualStyleElement.Button.PushButton.Normal;
renderer = new VisualStyleRenderer(element);
SetupElementCollection();
SetupTreeView();
this.Controls.AddRange(new Control[] { treeView1,
domainUpDown1, label1 });
}
// Use reflection to build a Dictionary of all
// VisualStyleElement objects exposed in the
// System.Windows.Forms.VisualStyles namespace.
private void SetupElementCollection()
{
StringBuilder elementName = new StringBuilder();
VisualStyleElement currentElement;
int plusSignIndex = 0;
// Get array of first-level nested types within
// VisualStyleElement; these are the element classes.
Type[] elementClasses =
typeof(VisualStyleElement).GetNestedTypes();
foreach (Type elementClass in elementClasses)
{
// Get an array of second-level nested types within
// VisualStyleElement; these are the element parts.
Type[] elementParts = elementClass.GetNestedTypes();
// Get the index of the first '+' character in
// the full element class name.
plusSignIndex = elementClass.FullName.IndexOf('+');
foreach (Type elementPart in elementParts)
{
// Get an array of static property details
// for the current type. Each of these types have
// properties that return VisualStyleElement objects.
PropertyInfo[] elementProperties =
elementPart.GetProperties(BindingFlags.Static |
BindingFlags.Public);
// For each property, insert the unique full element
// name and the element into the collection.
foreach (PropertyInfo elementProperty in
elementProperties)
{
// Get the element.
currentElement =
(VisualStyleElement)elementProperty.
GetValue(null, BindingFlags.Static, null,
null, null);
// Append the full element name.
elementName.Append(elementClass.FullName,
plusSignIndex + 1,
elementClass.FullName.Length -
plusSignIndex - 1);
elementName.Append("." +
elementPart.Name.ToString() + "." +
elementProperty.Name);
// Add the element and element name to
// the Dictionary.
elementDictionary.Add(elementName.ToString(),
currentElement);
// Clear the element name for the
// next iteration.
elementName.Remove(0, elementName.Length);
}
}
}
}
// Initialize the tree view with the element names.
private void SetupTreeView()
{
treeView1.Location = new Point(10, 10);
treeView1.Size = new Size(300, 450);
treeView1.BorderStyle = BorderStyle.FixedSingle;
treeView1.BackColor = Color.WhiteSmoke;
treeView1.SelectedNode = null;
treeView1.AfterSelect +=
new TreeViewEventHandler(treeView1_AfterSelect);
treeView1.BeginUpdate();
// An index into the top-level tree nodes.
int nodeIndex = 0;
// An index into the first '.' character in an element name.
int firstDotIndex = 0;
// Initialize the element class name to compare
// with the class name of the first element
// in the Dictionary, and set this name to the first
// top-level node.
StringBuilder compareClassName =
new StringBuilder("Button");
treeView1.Nodes.Add(
new TreeNode(compareClassName.ToString()));
// The current element class name.
StringBuilder currentClassName = new StringBuilder();
// The text for each second-level node.
StringBuilder nodeText = new StringBuilder();
foreach (KeyValuePair<string, VisualStyleElement> entry
in elementDictionary)
{
// Isolate the class name of the current element.
firstDotIndex = entry.Key.IndexOf('.');
currentClassName.Append(entry.Key, 0, firstDotIndex);
// Determine whether we need to increment to the next
// element class.
if (currentClassName.ToString() !=
compareClassName.ToString())
{
// Increment the index to the next top-level node
// in the tree view.
nodeIndex++;
// Get the new class name to compare with.
compareClassName.Remove(0, compareClassName.Length);
compareClassName.Append(entry.Key);
compareClassName.Remove(firstDotIndex,
compareClassName.Length - firstDotIndex);
// Add a new top-level node to the tree view.
treeView1.Nodes.Add(
new TreeNode(compareClassName.ToString()));
}
// Get the text for the new second-level node.
nodeText.Append(entry.Key, firstDotIndex + 1,
entry.Key.Length - firstDotIndex - 1);
// Create and insert the new second-level node.
TreeNode newNode = new TreeNode(nodeText.ToString());
newNode.Name = entry.Key;
treeView1.Nodes[nodeIndex].Nodes.Add(newNode);
currentClassName.Remove(0, currentClassName.Length);
nodeText.Remove(0, nodeText.Length);
}
treeView1.EndUpdate();
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
// Do nothing further if visual styles are disabled.
if (!Application.RenderWithVisualStyles)
{
this.Text = "Visual styles are disabled.";
TextRenderer.DrawText(e.Graphics, this.Text, this.Font,
this.Location, this.ForeColor);
return;
}
// Draw the element description.
TextRenderer.DrawText(e.Graphics, elementDescription.ToString(),
this.Font, descriptionRect, this.ForeColor,
TextFormatFlags.WordBreak);
// Draw the element, if an element is selected.
if (drawElement)
{
renderer.DrawBackground(e.Graphics, this.displayRect);
}
}
// Set the element to draw.
void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
{
// Clear the element description.
elementDescription.Remove(0, elementDescription.Length);
// If the user clicked a first-level node, disable drawing.
if (e.Node.Nodes.Count > 0)
{
drawElement = false;
elementDescription.Append("No element is selected");
domainUpDown1.Enabled = false;
}
// The user clicked an element node.
else
{
// Add the element name to the description.
elementDescription.Append(e.Node.Text);
// Get the element that corresponds to the selected
// node's name.
String key = e.Node.Name;
element = elementDictionary[key];
// Disable resizing if the element is not defined.
if (!VisualStyleRenderer.IsElementDefined(element))
{
drawElement = false;
elementDescription.Append(" is not defined.");
domainUpDown1.Enabled = false;
}
else
{
// Set the element to the renderer.
drawElement = true;
renderer.SetParameters(element);
elementDescription.Append(" is defined.");
// Get the system-defined size of the element.
Graphics g = this.CreateGraphics();
currentTrueSize = renderer.GetPartSize(g,
ThemeSizeType.True);
g.Dispose();
displayRect.Size = currentTrueSize;
domainUpDown1.Enabled = true;
domainUpDown1.SelectedIndex = 2;
}
}
Invalidate();
}
// Resize the element display area.
void domainUpDown1_SelectedItemChanged(object sender,
EventArgs e)
{
switch ((int)domainUpDown1.SelectedItem)
{
case (int)elementSizes.TrueSize:
displayRect.Size = currentTrueSize;
break;
case (int)elementSizes.Medium:
displayRect.Size =
new Size(displayRectFull.Width / 2,
displayRectFull.Height / 2);
break;
case (int)elementSizes.Large:
displayRect.Size = displayRectFull.Size;
break;
}
Invalidate();
}
// These values represent the options in the UpDown control.
private enum elementSizes
{
TrueSize,
Medium,
Large
};
}
}
Imports System.Text
Imports System.Drawing
Imports System.Collections.Generic
Imports System.Reflection
Imports System.Windows.Forms
Imports System.Windows.Forms.VisualStyles
Namespace VisualStyleElementViewer
Class Form1
Inherits Form
Public Sub New()
Dim ElementViewer1 As New ElementViewer()
With Me
.Controls.Add(ElementViewer1)
.Text = ElementViewer1.Text
.Size = New Size(700, 550)
End With
End Sub
<STAThread()> Shared Sub Main()
Application.EnableVisualStyles()
Application.Run(New Form1())
End Sub
End Class
Public Class ElementViewer
Inherits UserControl
Private element As VisualStyleElement
Private renderer As VisualStyleRenderer
Private elementDictionary As New Dictionary(Of String, _
VisualStyleElement)
Private descriptionRect As Rectangle
Private displayRect As Rectangle
Private displayRectFull As Rectangle
Private currentTrueSize As New Size()
Private elementDescription As New StringBuilder()
Private label1 As New Label()
Private WithEvents treeView1 As New TreeView()
Private WithEvents domainUpDown1 As New DomainUpDown()
Private drawElement As Boolean = False
Public Sub New()
With Me
.Location = New Point(10, 10)
.Size = New Size(650, 500)
.Text = "VisualStyleElement Viewer"
.Font = SystemFonts.IconTitleFont
.BackColor = Color.White
.BorderStyle = BorderStyle.Fixed3D
.AutoSize = True
End With
End Sub
Private Sub ElementViewer_Load(ByVal sender As Object, _
ByVal e As EventArgs) Handles Me.Load
' Make sure the visual styles are enabled before
' going any further.
If Not Application.RenderWithVisualStyles Then
Return
End If
With label1
.Location = New Point(320, 10)
.Size = New Size(300, 60)
.Text = "Expand the element class nodes in the " + _
"tree view to access visual style elements. " + _
"Click an element name to draw the element " + _
"below. To change the size of a resizable " + _
"element, use the spin control."
End With
With domainUpDown1
.Location = New Point(320, 80)
.Size = New Size(70, 30)
.ReadOnly = True
.Items.Add(elementSizes.Large)
.Items.Add(elementSizes.Medium)
.Items.Add(elementSizes.TrueSize)
.SelectedIndex = 2
.DownButton()
End With
descriptionRect = New Rectangle(320, 120, 250, 50)
displayRect = New Rectangle(320, 160, 0, 0)
displayRectFull = New Rectangle(320, 160, 300, 200)
' Initialize the element and renderer to known good values.
element = VisualStyleElement.Button.PushButton.Normal
renderer = New VisualStyleRenderer(element)
SetupElementCollection()
SetupTreeView()
Me.Controls.AddRange(New Control() {treeView1, _
domainUpDown1, label1})
End Sub
' Use reflection to build a Dictionary of all
' VisualStyleElement objects exposed in the
' System.Windows.Forms.VisualStyles namespace.
Private Sub SetupElementCollection()
Dim elementName As New StringBuilder()
Dim currentElement As VisualStyleElement
Dim tempObject As Object
Dim plusSignIndex As Integer = 0
' Get array of first-level nested types within
' VisualStyleElement; these are the element classes.
Dim elementClasses As Type() = _
GetType(VisualStyleElement).GetNestedTypes()
Dim elementClass As Type
For Each elementClass In elementClasses
' Get an array of second-level nested types within
' VisualStyleElement; these are the element parts.
Dim elementParts As Type() = _
elementClass.GetNestedTypes()
' Get the index of the first '+' character in
' the full element class name.
plusSignIndex = elementClass.FullName.IndexOf("+")
Dim elementPart As Type
For Each elementPart In elementParts
' Get an array of Shared property details
' for the current type. Each of these types have
' properties that return VisualStyleElement objects.
Dim elementProperties As PropertyInfo() = _
elementPart.GetProperties( _
(BindingFlags.Static Or BindingFlags.Public))
' For each property, insert the unique full element
' name and the element into the collection.
Dim elementProperty As PropertyInfo
For Each elementProperty In elementProperties
' Get the element.
tempObject = elementProperty.GetValue( _
Nothing, BindingFlags.Static, Nothing, _
Nothing, Nothing)
currentElement = CType(tempObject, _
VisualStyleElement)
' Append the full element name.
elementName.Append(elementClass.FullName, _
plusSignIndex + 1, _
elementClass.FullName.Length - _
plusSignIndex - 1)
elementName.Append(("." + _
elementPart.Name.ToString() + _
"." + elementProperty.Name))
' Add the element and element name to
' the Dictionary.
elementDictionary.Add(elementName.ToString(), _
currentElement)
' Clear the element name for the next iteration.
elementName.Remove(0, elementName.Length)
Next elementProperty
Next elementPart
Next elementClass
End Sub
' Initialize the tree view with the element names.
Private Sub SetupTreeView()
With treeView1
.Location = New Point(10, 10)
.Size = New Size(300, 450)
.BorderStyle = BorderStyle.FixedSingle
.BackColor = Color.WhiteSmoke
.SelectedNode = Nothing
.BeginUpdate()
End With
' An index into the top-level tree nodes.
Dim nodeIndex As Integer = 0
' An index into the first '.' character in an element name.
Dim firstDotIndex As Integer = 0
' Initialize the element class name to compare
' with the class name of the first element
' in the Dictionary, and set this name to the first
' top-level node.
Dim compareClassName As New StringBuilder("Button")
treeView1.Nodes.Add( _
New TreeNode(compareClassName.ToString()))
' The current element class name.
Dim currentClassName As New StringBuilder()
' The text for each second-level node.
Dim nodeText As New StringBuilder()
Dim entry As KeyValuePair(Of String, VisualStyleElement)
For Each entry In elementDictionary
' Isolate the class name of the current element.
firstDotIndex = entry.Key.IndexOf(".")
currentClassName.Append(entry.Key, 0, firstDotIndex)
' Determine whether we need to increment to the next
' element class.
If currentClassName.ToString() <> _
compareClassName.ToString() Then
' Increment the index to the next top-level node
' in the tree view.
nodeIndex += 1
' Update the class name to compare with.
compareClassName.Remove(0, compareClassName.Length)
compareClassName.Append(entry.Key)
compareClassName.Remove(firstDotIndex, _
compareClassName.Length - firstDotIndex)
' Add a new top-level node to the tree view.
Dim node As New TreeNode(compareClassName.ToString())
treeView1.Nodes.Add(node)
End If
' Get the text for the new second-level node.
nodeText.Append(entry.Key, firstDotIndex + 1, _
entry.Key.Length - firstDotIndex - 1)
' Create and insert the new second-level node.
Dim newNode As New TreeNode(nodeText.ToString())
newNode.Name = entry.Key
treeView1.Nodes(nodeIndex).Nodes.Add(newNode)
currentClassName.Remove(0, currentClassName.Length)
nodeText.Remove(0, nodeText.Length)
Next entry
treeView1.EndUpdate()
End Sub
Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
MyBase.OnPaint(e)
' Do nothing further if visual styles are disabled.
If Not Application.RenderWithVisualStyles Then
Me.Text = "Visual styles are disabled."
TextRenderer.DrawText(e.Graphics, Me.Text, Me.Font, _
Me.Location, Me.ForeColor)
Return
End If
' Draw the element description.
TextRenderer.DrawText(e.Graphics, _
elementDescription.ToString(), Me.Font, _
descriptionRect, Me.ForeColor, _
TextFormatFlags.WordBreak)
' Draw the element, if an element is selected.
If drawElement Then
renderer.DrawBackground(e.Graphics, Me.displayRect)
End If
End Sub
' Set the element to draw.
Private Sub treeView1_AfterSelect(ByVal sender As Object, _
ByVal e As TreeViewEventArgs) Handles treeView1.AfterSelect
' Clear the element description.
elementDescription.Remove(0, elementDescription.Length)
' If the user clicked a first-level node, disable drawing.
If e.Node.Nodes.Count > 0 Then
drawElement = False
elementDescription.Append("No element is selected")
domainUpDown1.Enabled = False
' The user clicked an element node.
Else
' Add the element name to the description.
elementDescription.Append(e.Node.Text)
' Get the element that corresponds to the selected
' node's name.
Dim key As String = e.Node.Name
element = elementDictionary(key)
' Disable resizing if the element is not defined.
If Not VisualStyleRenderer.IsElementDefined(element) Then
drawElement = False
elementDescription.Append(" is not defined.")
domainUpDown1.Enabled = False
Else
' Set the element to the renderer.
drawElement = True
renderer.SetParameters(element)
elementDescription.Append(" is defined.")
' Get the system-defined size of the element.
Dim g As Graphics = Me.CreateGraphics()
currentTrueSize = renderer.GetPartSize(g, _
ThemeSizeType.True)
g.Dispose()
displayRect.Size = currentTrueSize
domainUpDown1.Enabled = True
domainUpDown1.SelectedIndex = 2
End If
End If
Invalidate()
End Sub
' Resize the element display area.
Private Sub domainUpDown1_SelectedItemChanged(ByVal sender As Object, _
ByVal e As EventArgs) _
Handles domainUpDown1.SelectedItemChanged
Select Case CInt(domainUpDown1.SelectedItem)
Case CInt(elementSizes.TrueSize)
displayRect.Size = currentTrueSize
Case CInt(elementSizes.Medium)
displayRect.Size = _
New Size(displayRectFull.Width / 2, _
displayRectFull.Height / 2)
Case CInt(elementSizes.Large)
displayRect.Size = displayRectFull.Size
End Select
Invalidate()
End Sub
' These values represent the options in the UpDown control.
Private Enum elementSizes
TrueSize
Medium
Large
End Enum
End Class
End Namespace
注釈
クラスは VisualStyleElement 、オペレーティング システムの現在のビジュアル スタイルで定義されている Windows コントロールまたはユーザー インターフェイス (UI) 要素を識別します。 visual スタイル要素は、 クラス、 パーツ、および 状態の観点から定義されます。
クラスは、通常一緒に描画される関連するビジュアル スタイル要素のグループを識別します。 クラスは、 プロパティによって ClassName 指定されます。
パーツは、クラスの個別のメンバーを定義します。 パーツは、 プロパティで Part 指定します。
状態は、 クラスとパーツによって定義された要素の現在のビジュアル状態を表します。 状態は、 プロパティによって State 指定されます。
名前空間は System.Windows.Forms.VisualStyles 、ビジュアル スタイルで定義できるコントロールとユーザー インターフェイス要素を表す何百も VisualStyleElement のオブジェクトを公開します。 これらのオブジェクトは、 の入れ子になったクラスVisualStyleElementのプロパティとしてstatic公開されます。 プロパティごとに、所有するクラスの修飾名は、描画された要素のクラスと部分を表し、プロパティ名は要素の状態を表します。 たとえば、 プロパティは VisualStyleElement.Button.PushButton.Pressed 、 を返 VisualStyleElement します。これは、表示スタイルを使用して押された状態のボタンを描画するために使用できます。 プロパティ名は Pressed 、状態に対応し、 PushButton パーツに対応し Button 、visual スタイル要素のクラスを識別します。
visual スタイル要素を描画するには、 を VisualStyleRenderer作成し、描画する に VisualStyleElement 設定してから、 メソッドを DrawBackground 呼び出します。 現在のビジュアル スタイルが特定の要素の定義を提供するかどうかを判断するには、 要素を引数として を使用して IsElementDefined メソッドを呼び出します。
VisualStyleElement と は、 VisualStyleRenderer Windows Platform SDK の Windows シェル部分からビジュアル スタイル API の機能をラップします。 ビジュアル スタイルの詳細については、「Visual Styles」を参照してください。
プロパティ
| ClassName |
この VisualStyleElement が表す visual スタイル要素のクラス名を取得します。 |
| Part |
この VisualStyleElement が表す visual スタイル要素の部品を示す値を取得します。 |
| State |
この VisualStyleElement が表す visual スタイル要素の状態を示す値を取得します。 |
メソッド
| CreateElement(String, Int32, Int32) |
指定されたクラス、部品、および状態の各値から新しい visual スタイル要素を作成します。 |
| Equals(Object) |
指定されたオブジェクトが現在のオブジェクトと等しいかどうかを判断します。 (継承元 Object) |
| GetHashCode() |
既定のハッシュ関数として機能します。 (継承元 Object) |
| GetType() |
現在のインスタンスの Type を取得します。 (継承元 Object) |
| MemberwiseClone() |
現在の Object の簡易コピーを作成します。 (継承元 Object) |
| ToString() |
現在のオブジェクトを表す文字列を返します。 (継承元 Object) |
適用対象
こちらもご覧ください
GitHub で Microsoft と共同作業する
このコンテンツのソースは GitHub にあります。そこで、issue や pull request を作成および確認することもできます。 詳細については、共同作成者ガイドを参照してください。
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