C# Rect Tracker

本文轉自http://www.codeproject.com/KB/miscctrl/CSharpRectTracker.aspx

 

• Download source code - 18.7 Kb

Introduction

Ever tried to find that object that allows Visual studio to move and resize controls? Well, I didn't find it in C# but in C++. Well, here it is in C#

Background

The project I was working on required me to create forms in run-time, so I needed something to edit controls - RectTracker.

In C++ there is an object called CRectTracker, but in C# there isn't, so I tried to clone it, it doesn't do what the Visual Studio Tracker does, but it does the job on resizing and moving controls on a form.

Methodology

It's made of a UserControl because doing it using the form graphics object creates ordering problems (a control is "above" the tracker), so making it a control itself, allows me to play with Z-Order and set the control to front.

I used Region Transparenting to create a place for the Control I want to move/resize.

Using The Code Collapse | Copy Code

    SomeControl.BringToFront();SomeControl.Capture = false;if(this.Controls.Contains(CSharpTracker))  this.Controls.Remove(CSharpTracker);CSharpTracker = new RectTracker(SomeControl);this.Controls.Add(CSharpTracker);CSharpTracker.BringToFront();CSharpTracker.Draw();    

Control Moving Collapse | Copy Code

public void Mouse_Move(object sender,System.Windows.Forms.MouseEventArgs e)    {//minimum size for the control is 8x8if (currentControl.Height < 8){  currentControl.Height = 8;  return;}else if (currentControl.Width < 8){  currentControl.Width = 8;  return;}    switch(this.CurrBorder){  case RESIZE_BORDER.RB_TOP:    currentControl.Height = currentControl.Height - e.Y + prevLeftClick.Y;    if (currentControl.Height > 8)    currentControl.Top = currentControl.Top + e.Y - prevLeftClick.Y;        break;  case RESIZE_BORDER.RB_TOPLEFT:    currentControl.Height = currentControl.Height - e.Y + prevLeftClick.Y;    if (currentControl.Height > 8)    currentControl.Top =currentControl.Top + e.Y - prevLeftClick.Y;    currentControl.Width = currentControl.Width - e.X + prevLeftClick.X;    if (currentControl.Width > 8)    currentControl.Left =currentControl.Left + e.X - prevLeftClick.X;    break;  case RESIZE_BORDER.RB_TOPRIGHT:    currentControl.Height = currentControl.Height - e.Y + prevLeftClick.Y;    if (currentControl.Height > 8)    currentControl.Top = currentControl.Top + e.Y - prevLeftClick.Y;    currentControl.Width = currentControl.Width + e.X - prevLeftClick.X;    break;  case RESIZE_BORDER.RB_RIGHT:    currentControl.Width = currentControl.Width + e.X - prevLeftClick.X;    break;  case RESIZE_BORDER.RB_BOTTOM:    currentControl.Height = currentControl.Height + e.Y - prevLeftClick.Y;    break;  case RESIZE_BORDER.RB_BOTTOMLEFT:    currentControl.Height = currentControl.Height + e.Y - prevLeftClick.Y;    currentControl.Width = currentControl.Width - e.X + prevLeftClick.X;    if (currentControl.Width > 8)currentControl.Left = currentControl.Left + e.X - prevLeftClick.X;    break;  case RESIZE_BORDER.RB_BOTTOMRIGHT:    currentControl.Height = currentControl.Height + e.Y - prevLeftClick.Y;    currentControl.Width = currentControl.Width + e.X - prevLeftClick.X;    break;  case RESIZE_BORDER.RB_LEFT:    currentControl.Width = currentControl.Width - e.X + prevLeftClick.X;    if (currentControl.Width > 8)    currentControl.Left = currentControl.Left + e.X - prevLeftClick.X;    break;  case RESIZE_BORDER.RB_NONE:    currentControl.Location = new Point(currentControl.Location.X + e.X -     prevLeftClick.X, currentControl.Location.Y + e.Y - prevLeftClick.Y);    break;  }}    

Conclusion

This SharpRectTracker control is a clone of the CRectTracker, and it allows a user to Move and Resize form objects (control) in run-time, this control can be further enhanced to allow multiple object move/resize (using selection) and to do selectable Resize (for an object that only the width can be changed).

License

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