C#: Simple Runtime Control Sizing and Dragging Class
首先声明如下代码改自
CodeProject 同名文章(鸣谢原作者 Jim Korovessis: ~!@#$%^&*):
http://www.codeproject.com/cs/miscctrl/CSPickBoxSample1.asp
我做了如下改造:
1.增加一个 ArrayList 存储 WiredControls
2.增加 UnWireAllWiredControls() 方法,用于切换到控件"非设计"状态
3.增加 WireControls() 方法,用于到控件"设计"状态
4.增加支持键盘移动或改大小
我会把我更改的代码高亮显示!
*/
//You Can Save below code to one File named Noname1.cs
//execute "csc noname1.cs" Directly！
//PickBox
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
//namespace PickBoxTest
//{
/// <summary>
/// This class implements sizing and moving functions for
/// runtime editing of graphic controls
/// </summary>
public class PickBox
{
//////////////////////////////////////////////////////////////////
// PRIVATE CONSTANTS AND VARIABLES
//////////////////////////////////////////////////////////////////
private const int BOX_SIZE = 8;
private Color BOX_COLOR = Color.White;
// private ContainerControl m_container;
private Control m_control;
private Label[] lbl = new Label[8];
private int startl;
private int startt;
private int startw;
private int starth;
private int startx;
private int starty;
private bool dragging;
private Cursor[] arrArrow = new Cursor[]
{
Cursors.SizeNWSE
,Cursors.SizeNS
,Cursors.SizeNESW
,Cursors.SizeWE
,Cursors.SizeNWSE
,Cursors.SizeNS
,Cursors.SizeNESW
,Cursors.SizeWE
};
private Cursor oldCursor;
private const int MIN_SIZE = 20;
private Form ParentForm;
//
// Constructor creates 8 sizing handles & wires mouse events
// to each that implement sizing functions
//
public PickBox()
{
for (int i = 0; i < 8; i++)
{
lbl[i] = new Label();
lbl[i].TabIndex = i;
lbl[i].FlatStyle = 0 ;
lbl[i].BorderStyle = BorderStyle.FixedSingle;
lbl[i].BackColor = BOX_COLOR;
lbl[i].Cursor = arrArrow[i];
lbl[i].Text = "";
lbl[i].BringToFront();
lbl[i].MouseDown += new MouseEventHandler(this.lbl_MouseDown);
lbl[i].MouseMove += new MouseEventHandler(this.lbl_MouseMove);
lbl[i].MouseUp += new MouseEventHandler(this.lbl_MouseUp);
}
}
//////////////////////////////////////////////////////////////////
// PUBLIC METHODS
//////////////////////////////////////////////////////////////////
//
// Wires a Click event handler to the passed Control
// that attaches a pick box to the control when it is clicked
//
//add by playyuer㊣Microshaoft.com
// Store Controls for Design (resize or move)
private ArrayList WiredControls = new ArrayList();
public void WireControl(Control ctl)
{
//add by playyuer㊣Microshaoft.com
//Store Wired Controls
WiredControls.Add(ctl);
if (ParentForm != ctl.FindForm())
{
ParentForm = ctl.FindForm();
//ParentForm.KeyPreview = true;
}
ctl.Click += new EventHandler(this.SelectControl);
//add by playyuer㊣Microshaoft.com
//support resizing or moving control by Keyboard
ctl.KeyDown += new KeyEventHandler(ctl_KeyDown);
}
//add by playyuer㊣Microshaoft.com
//for Wire Controls that in WiredControls ArrayList
public void WireControls()
{
if (WiredControls.Count > 0)
{
System.Collections.IEnumerator ie = WiredControls.GetEnumerator();
while ( ie.MoveNext() )
{
this.WireControl((Control) ie.Current);
}
}
}
//add by playyuer㊣Microshaoft.com
//for UnWire Controls that in WiredControls ArrayList
public void UnWireAllWiredControls()
{
System.Collections.IEnumerator ie = WiredControls.GetEnumerator();
Control c;
while ( ie.MoveNext() )
{
c = (Control) ie.Current;
c.Click -= new EventHandler(this.SelectControl);
c.KeyDown -= new KeyEventHandler(ctl_KeyDown);
if (m_control is Control)
{
m_control.Cursor = oldCursor;
//Remove event any pre-existing event handlers appended by this class
m_control.MouseDown -= new MouseEventHandler(this.ctl_MouseDown);
m_control.MouseMove -= new MouseEventHandler(this.ctl_MouseMove);
m_control.MouseUp -= new MouseEventHandler(this.ctl_MouseUp);
m_control.KeyDown -= new KeyEventHandler(ctl_KeyDown);
m_control = null;
}
}
this.HideHandles();
}
/////////////////////////////////////////////////////////////////
// PRIVATE METHODS
/////////////////////////////////////////////////////////////////
//
// Attaches a pick box to the sender Control
//
private void SelectControl(object sender, EventArgs e)
{
if (m_control is Control)
{
m_control.Cursor = oldCursor;
//Remove event any pre-existing event handlers appended by this class
m_control.MouseDown -= new MouseEventHandler(this.ctl_MouseDown);
m_control.MouseMove -= new MouseEventHandler(this.ctl_MouseMove);
m_control.MouseUp -= new MouseEventHandler(this.ctl_MouseUp);
m_control = null;
}
m_control = (Control) sender;
//Add event handlers for moving the selected control around
m_control.MouseDown += new MouseEventHandler(this.ctl_MouseDown);
m_control.MouseMove += new MouseEventHandler(this.ctl_MouseMove);
m_control.MouseUp += new MouseEventHandler(this.ctl_MouseUp);
//Add sizing handles to Control's container (Form or PictureBox)
for (int i = 0; i < 8; i++)
{
m_control.Parent.Controls.Add(lbl[i]);
lbl[i].BringToFront();
}
//Position sizing handles around Control
MoveHandles();
//Display sizing handles
ShowHandles();
oldCursor = m_control.Cursor;
m_control.Cursor = Cursors.SizeAll;
}
public void Remove()
{
HideHandles();
m_control.Cursor = oldCursor;
}
private void ShowHandles()
{
if (m_control !=null)
{
for (int i = 0; i < 8; i++)
{
lbl[i].Visible = true;
}
}
}
private void HideHandles()
{
for (int i = 0; i < 8; i++)
{
lbl[i].Visible = false;
}
}
private void MoveHandles()
{
int sX = m_control.Left - BOX_SIZE;
int sY = m_control.Top - BOX_SIZE;
int sW = m_control.Width + BOX_SIZE;
int sH = m_control.Height + BOX_SIZE;
int hB = BOX_SIZE / 2;
int[] arrPosX = new int[]
{
sX+hB, sX + sW / 2
,sX + sW-hB
,sX + sW-hB
,sX + sW-hB
,sX + sW / 2
,sX+hB, sX+hB
};
int[] arrPosY = new int[]
{
sY+hB
,sY+hB
,sY+hB
,sY + sH / 2
, sY + sH-hB
,sY + sH-hB
,sY + sH-hB
,sY + sH / 2
};
for (int i = 0; i < 8; i++)
lbl[i].SetBounds(arrPosX[i], arrPosY[i], BOX_SIZE, BOX_SIZE);
}
/////////////////////////////////////////////////////////////////
// MOUSE EVENTS THAT IMPLEMENT SIZING OF THE PICKED CONTROL
/////////////////////////////////////////////////////////////////
//
// Store control position and size when mouse button pushed over
// any sizing handle
//
private void lbl_MouseDown(object sender, MouseEventArgs e)
{
dragging = true;
startl = m_control.Left;
startt = m_control.Top;
startw = m_control.Width;
starth = m_control.Height;
HideHandles();
}
//
// Size the picked control in accordance with sizing handle being dragged
// 0 1 2
// 7 3
// 6 5 4
//
private void lbl_MouseMove(object sender, MouseEventArgs e)
{
int l = m_control.Left;
int w = m_control.Width;
int t = m_control.Top;
int h = m_control.Height;
if (dragging)
{
switch (((Label)sender).TabIndex)
{
case 0 : // Dragging top-left sizing box
l = startl + e.X < startl + startw - MIN_SIZE ? startl + e.X : startl + startw - MIN_SIZE;
t = startt + e.Y < startt + starth - MIN_SIZE ? startt + e.Y : startt + starth - MIN_SIZE;
w = startl + startw - m_control.Left;
h = startt + starth - m_control.Top;
break;
case 1 : // Dragging top-center sizing box
t = startt + e.Y < startt + starth - MIN_SIZE ? startt + e.Y : startt + starth - MIN_SIZE;
h = startt + starth - m_control.Top;
break;
case 2 : // Dragging top-right sizing box
w = startw + e.X > MIN_SIZE ? startw + e.X : MIN_SIZE;
t = startt + e.Y < startt + starth - MIN_SIZE ? startt + e.Y : startt + starth - MIN_SIZE;
h = startt + starth - m_control.Top;
break;
case 3 : // Dragging right-middle sizing box
w = startw + e.X > MIN_SIZE ? startw + e.X : MIN_SIZE;
break;
case 4 : // Dragging right-bottom sizing box
w = startw + e.X > MIN_SIZE ? startw + e.X : MIN_SIZE;
h = starth + e.Y > MIN_SIZE ? starth + e.Y : MIN_SIZE;
break;
case 5 : // Dragging center-bottom sizing box
h = starth + e.Y > MIN_SIZE ? starth + e.Y : MIN_SIZE;
break;
case 6 : // Dragging left-bottom sizing box
l = startl + e.X < startl + startw - MIN_SIZE ? startl + e.X : startl + startw - MIN_SIZE;
w = startl + startw - m_control.Left;
h = starth + e.Y > MIN_SIZE ? starth + e.Y : MIN_SIZE;
break;
case 7 : // Dragging left-middle sizing box
l = startl + e.X < startl + startw - MIN_SIZE ? startl + e.X : startl + startw - MIN_SIZE;
w = startl + startw - m_control.Left;
break;
}
l = (l < 0)? 0 : l;
t = (t < 0)? 0 : t;
m_control.SetBounds(l,t,w,h);
}
}
//
// Display sizing handles around picked control once sizing has completed
//
private void lbl_MouseUp(object sender, MouseEventArgs e)
{
dragging = false;
MoveHandles();
ShowHandles();
}
/////////////////////////////////////////////////////////////////
// MOUSE EVENTS THAT MOVE THE PICKED CONTROL AROUND THE FORM
/////////////////////////////////////////////////////////////////
//
// Get mouse pointer starting position on mouse down and hide sizing handles
//
private void ctl_MouseDown(object sender, MouseEventArgs e)
{
dragging = true;
startx = e.X;
starty = e.Y;
HideHandles();
}
//
// Reposition the dragged control
//
private void ctl_MouseMove(object sender, MouseEventArgs e)
{
if (dragging)
{
int l = m_control.Left + e.X - startx;
int t = m_control.Top + e.Y - starty;
int w = m_control.Width;
int h = m_control.Height;
l = (l < 0)? 0 : ((l + w > m_control.Parent.ClientRectangle.Width)? m_control.Parent.ClientRectangle.Width - w : l);
t = (t < 0)? 0 : ((t + h > m_control.Parent.ClientRectangle.Height)? m_control.Parent.ClientRectangle.Height - h : t);
m_control.Left = l;
m_control.Top = t;
}
}
//
// Display sizing handles around picked control once dragging has completed
//
private void ctl_MouseUp(object sender, MouseEventArgs e)
{
dragging = false;
MoveHandles();
ShowHandles();
}
private void ctl_KeyDown(object sender, KeyEventArgs e)
{
if (e.Modifiers == Keys.Control)
{
switch (e.KeyCode)
{
case Keys.Right :
m_control.Left += 10;
break;
case Keys.Left :
m_control.Left -= 10;
break;
case Keys.Up :
m_control.Top -= 10;
break;
case Keys.Down :
m_control.Top += 10;
break;
}
MoveHandles();
}
else if (e.Modifiers == Keys.Shift)
{
switch (e.KeyCode)
{
case Keys.Right :
m_control.Width += 10;
break;
case Keys.Left :
m_control.Width -= 10;
break;
case Keys.Up :
m_control.Height -= 10;
break;
case Keys.Down :
m_control.Height += 10;
break;
}
MoveHandles();
}
//((Control)sender).Select();
}
}
//}
//==================================================
//WinForm Test
//Form1
//using System;
//using System.Drawing;
//using System.Collections;
//using System.ComponentModel;
//using System.Windows.Forms;
//using System.Data;
//namespace WindowsApplication1
//{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Button button1;
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.DataGrid dataGrid1;
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;
private System.Windows.Forms.DataGrid dataGrid2;
private System.Windows.Forms.Button button2;
//add by playyuer㊣Microshaoft.com
private PickBox pb = new PickBox();
public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();
//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
}
/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.button1 = new System.Windows.Forms.Button();
this.textBox1 = new System.Windows.Forms.TextBox();
this.dataGrid1 = new System.Windows.Forms.DataGrid();
this.dataGrid2 = new System.Windows.Forms.DataGrid();
this.button2 = new System.Windows.Forms.Button();
((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).BeginInit();
((System.ComponentModel.ISupportInitialize)(this.dataGrid2)).BeginInit();
this.SuspendLayout();
//
// button1
//
this.button1.Location = new System.Drawing.Point(24, 16);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(104, 40);
this.button1.TabIndex = 0;
this.button1.Text = "切换";
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(144, 32);
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size(128, 21);
this.textBox1.TabIndex = 1;
this.textBox1.Text = "textBox1";
//
// dataGrid1
//
this.dataGrid1.DataMember = "";
this.dataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText;
this.dataGrid1.Location = new System.Drawing.Point(32, 80);
this.dataGrid1.Name = "dataGrid1";
this.dataGrid1.Size = new System.Drawing.Size(160, 72);
this.dataGrid1.TabIndex = 2;
//
// dataGrid2
//
this.dataGrid2.DataMember = "";
this.dataGrid2.HeaderForeColor = System.Drawing.SystemColors.ControlText;
this.dataGrid2.Location = new System.Drawing.Point(64, 208);
this.dataGrid2.Name = "dataGrid2";
this.dataGrid2.Size = new System.Drawing.Size(168, 64);
this.dataGrid2.TabIndex = 3;
//
// button2
//
this.button2.Location = new System.Drawing.Point(280, 144);
this.button2.Name = "button2";
this.button2.Size = new System.Drawing.Size(152, 56);
this.button2.TabIndex = 4;
this.button2.Text = "button2";
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(608, 381);
this.Controls.Add(this.button2);
this.Controls.Add(this.dataGrid2);
this.Controls.Add(this.dataGrid1);
this.Controls.Add(this.textBox1);
this.Controls.Add(this.button1);
this.Name = "Form1";
this.Text = "Form1";
this.KeyDown += new System.Windows.Forms.KeyEventHandler(this.Form1_KeyDown);
this.Load += new System.EventHandler(this.Form1_Load);
((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).EndInit();
((System.ComponentModel.ISupportInitialize)(this.dataGrid2)).EndInit();
this.ResumeLayout(false);
}
#endregion
/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
private void Form1_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
{
}
bool b = false;
private void button1_Click(object sender, System.EventArgs e)
{
if (!b)
{
this.Text = "Design Time";
pb.WireControl(dataGrid1);
pb.WireControl(textBox1);
pb.WireControl(button2);
pb.WireControl(dataGrid2);
}
else
{
this.Text = "Run Time";
pb.UnWireAllWiredControls();
}
b = !b;
}
private void Form1_Load(object sender, System.EventArgs e)
{
}
}
//}