所有者绘制的列表框，具有热跟踪功能 [英] owner drawn listBox with hot tracking

问题描述

大家好.

我创建了一个列表框，其中启用了所有者绘制变量属性，并处理了绘制和测量项目事件以对其进行自定义.

问题是:

我使用了渐变笔刷进行选择，但是颜色从列表框的顶部到底部都发生了变化.:confused:我希望为所有此类项目制作一种渐变色.

http://img198.imageshack.us/img198/1360/illustrationn.png

我也希望以相同的颜色实现热跟踪.

我使用的代码:

Hello everybody.

I made a list box with the owner draw variable property enabled and handled both draw and measure item events to customize it.

the problem is:

I used a gradient brush for the selection but the color changes from the top of the list box to its bottom.:confused: I wish to make one gradient color for all the items like this.

http://img198.imageshack.us/img198/1360/illustrationn.png

I also wish to implement hot tracking with the same color.

The code I used:

private: System::Void listBox1_DrawItem(System::Object^ sender, System::Windows::Forms::DrawItemEventArgs^  e) 
{
  if ((e->State & DrawItemState::Selected) == DrawItemState::Selected)
  {
    Graphics^ G = listBox1->CreateGraphics();
    System::Drawing::Drawing2D::LinearGradientBrush^ myBrush =  gcnew System::Drawing::Drawing2D::LinearGradientBrush(ClientRectangle,Color::Azure, Color::Violet, System::Drawing::Drawing2D::LinearGradientMode::Vertical);
    System::Drawing::Drawing2D::LinearGradientBrush^ myBrush2 =  gcnew System::Drawing::Drawing2D::LinearGradientBrush(ClientRectangle,Color::LightBlue, Color::White, System::Drawing::Drawing2D::LinearGradientMode::Horizontal);
    System::Drawing::Pen^ P = gcnew System::Drawing::Pen(myBrush2);
    e->Graphics->FillRectangle(myBrush, e->Bounds);
    e->Graphics->DrawRectangle(P,e->Bounds);
  System::Drawing::Font^ F = gcnew System::Drawing::Font( "Microsoft Sans Serif",8 );
    e->Graphics->DrawString("Size:  600.4 MB	Last Modified::12/12/2012",F, Brushes::Black, e->Bounds.X+1, e->Bounds.Y+20);
    e->Graphics->DrawString("Type: Folder	Extension:ELF",F, Brushes::Black, e->Bounds.X+1, e->Bounds.Y+40);
    e->Graphics->DrawString("C:\\Files\\Folders\\Some Folder",F, Brushes::Green, e->Bounds.X+1, e->Bounds.Y+60);
  }
  else
  {
    e->Graphics->FillRectangle(Brushes::White, e->Bounds);
    System::Drawing::Pen^ Pe = gcnew System::Drawing::Pen(Color::White);					    e->Graphics->DrawRectangle(Pe,e->Bounds);
  }
  try
  {
    System::Drawing::Font^ F = gcnew System::Drawing::Font( "Microsoft Sans Serif",12 );
    e->Graphics->DrawString(listBox1->Items[e->Index]->ToString(),F, Brushes::Blue, e->Bounds.X, e->Bounds.Y);
// Draw the focus rectangle around the selected item.
				 e->DrawFocusRectangle();}
				 catch(Exception^ ex){}

			 }
private: System::Void listBox1_MeasureItem(System::Object^  sender, System::Windows::Forms::MeasureItemEventArgs^  e) {
				 e->ItemHeight += 65;
				 e->Index::get();
			 }

感谢您的帮助.
非常感谢.

I appreciate any help.
Thanks alot.

推荐答案

我真的应该集中精力.

我将[ClientRectangle]更改为[e-> Bounds]，一切顺利.

但仍然不了解热跟踪:(((

谁能给我逻辑或代码.我发现它与Mouse Enter，Move和Leave事件有关，但无法理解代码.它不是C ++中的.

是的，如何使选择矩形从边缘变圆?:confused:

再次感谢.

I really should have concentrated.

I changed [ClientRectangle] to [e->Bounds] and it went alright.

but still don''t know about Hot-tracking :((

could anybody give me logic or code. I found it''s related to Mouse Enter, Move, and Leave events but couldn''t understand the code. It wasn''t in C++.

and yes, how can I make the selection rectangle rounded from the edges?:confused:

Thanks again.

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