1 | using System;
|
---|
2 | using System.Drawing;
|
---|
3 | using System.Windows.Forms;
|
---|
4 |
|
---|
5 | namespace Netron.Diagramming.Core {
|
---|
6 |
|
---|
7 | class ConnectionTool : AbstractTool, IMouseListener {
|
---|
8 |
|
---|
9 | #region Fields
|
---|
10 | /// <summary>
|
---|
11 | /// the location of the mouse when the motion starts
|
---|
12 | /// </summary>
|
---|
13 | private Point initialPoint;
|
---|
14 | private bool doDraw;
|
---|
15 | #endregion
|
---|
16 |
|
---|
17 | #region Constructor
|
---|
18 | /// <summary>
|
---|
19 | /// Initializes a new instance of the <see cref="T:ConnectionTool"/> class.
|
---|
20 | /// </summary>
|
---|
21 | /// <param name="name">The name of the tool.</param>
|
---|
22 | public ConnectionTool(string name)
|
---|
23 | : base(name) {
|
---|
24 | }
|
---|
25 | #endregion
|
---|
26 |
|
---|
27 | #region Methods
|
---|
28 |
|
---|
29 | /// <summary>
|
---|
30 | /// Called when the tool is activated.
|
---|
31 | /// </summary>
|
---|
32 | protected override void OnActivateTool() {
|
---|
33 | Controller.View.CurrentCursor = CursorPalette.Grip;
|
---|
34 | this.SuspendOtherTools();
|
---|
35 | doDraw = false;
|
---|
36 | }
|
---|
37 |
|
---|
38 | /// <summary>
|
---|
39 | /// Handles the mouse down event
|
---|
40 | /// </summary>
|
---|
41 | /// <param name="e">The <see cref="T:System.Windows.Forms.MouseEventArgs"/> instance containing the event data.</param>
|
---|
42 | /// <returns>Returns 'true' if the event was handled, otherwise 'false'.</returns>
|
---|
43 | public bool MouseDown(MouseEventArgs e) {
|
---|
44 | if (e == null)
|
---|
45 | throw new ArgumentNullException("The argument object is 'null'");
|
---|
46 | if (e.Button == MouseButtons.Left && Enabled && !IsSuspended) {
|
---|
47 |
|
---|
48 | initialPoint = e.Location;
|
---|
49 | doDraw = true;
|
---|
50 | return true;
|
---|
51 | }
|
---|
52 | return false;
|
---|
53 | }
|
---|
54 |
|
---|
55 | /// <summary>
|
---|
56 | /// Handles the mouse move event
|
---|
57 | /// </summary>
|
---|
58 | /// <param name="e">The <see cref="T:System.Windows.Forms.MouseEventArgs"/> instance containing the event data.</param>
|
---|
59 | public void MouseMove(MouseEventArgs e) {
|
---|
60 | if (e == null)
|
---|
61 | throw new ArgumentNullException("The argument object is 'null'");
|
---|
62 | Point point = e.Location;
|
---|
63 | if (IsActive) {
|
---|
64 | if (foundConnector != null)
|
---|
65 | foundConnector.Hovered = false;
|
---|
66 | foundConnector = this.Controller.Model.Selection.FindConnectorAt(e.Location);
|
---|
67 | if (foundConnector != null)
|
---|
68 | foundConnector.Hovered = true;
|
---|
69 | }
|
---|
70 | if (IsActive && doDraw) {
|
---|
71 | Controller.View.PaintGhostLine(initialPoint, point);
|
---|
72 | Controller.View.Invalidate(System.Drawing.Rectangle.Inflate(Controller.View.Ghost.Rectangle, 20, 20));
|
---|
73 |
|
---|
74 |
|
---|
75 | }
|
---|
76 | }
|
---|
77 | private IConnector foundConnector;
|
---|
78 | /// <summary>
|
---|
79 | ///
|
---|
80 | /// </summary>
|
---|
81 | /// <param name="e">The <see cref="T:System.Windows.Forms.MouseEventArgs"/> instance containing the event data.</param>
|
---|
82 | public void MouseUp(MouseEventArgs e) {
|
---|
83 | if (IsActive) {
|
---|
84 | // First, make sure the initial point is far enough away from
|
---|
85 | // the final point to make a connection.
|
---|
86 | int maxX = Math.Abs(Math.Max(initialPoint.X, e.Location.X));
|
---|
87 | int maxY = Math.Abs(Math.Max(initialPoint.Y, e.Location.Y));
|
---|
88 |
|
---|
89 | if (!(maxX > ConnectionBase.MinLength) ||
|
---|
90 | !(maxY > ConnectionBase.MinLength)) {
|
---|
91 | return;
|
---|
92 | }
|
---|
93 |
|
---|
94 | //whatever comes hereafter, a compund command is the most economic approach
|
---|
95 | CompoundCommand package = new CompoundCommand(this.Controller);
|
---|
96 |
|
---|
97 | //let's see if the connection endpoints hit other connectors
|
---|
98 | //note that the following can be done because the actual connection has not been created yet
|
---|
99 | //otherwise the search would find the endpoints of the newly created connection, which
|
---|
100 | //would create a loop and a stack overflow!
|
---|
101 | IConnector startConnector = this.Controller.Model.Selection.FindConnectorAt(initialPoint);
|
---|
102 | IConnector endConnector = this.Controller.Model.Selection.FindConnectorAt(e.Location);
|
---|
103 |
|
---|
104 | #region Create the new connection
|
---|
105 | Connection cn = new Connection(this.initialPoint, e.Location, this.Controller.Model);
|
---|
106 | AddConnectionCommand newcon = new AddConnectionCommand(this.Controller, cn);
|
---|
107 |
|
---|
108 | #endregion
|
---|
109 |
|
---|
110 | #region Initial attachment?
|
---|
111 | if (startConnector != null) {
|
---|
112 | BindConnectorsCommand bindStart = new BindConnectorsCommand(this.Controller, startConnector, cn.From);
|
---|
113 | package.Commands.Add(bindStart);
|
---|
114 | }
|
---|
115 | #endregion
|
---|
116 |
|
---|
117 | #region Final attachment?
|
---|
118 | if (endConnector != null) {
|
---|
119 | BindConnectorsCommand bindEnd = new BindConnectorsCommand(this.Controller, endConnector, cn.To);
|
---|
120 | package.Commands.Add(bindEnd);
|
---|
121 | }
|
---|
122 | #endregion
|
---|
123 | package.Text = "New connection";
|
---|
124 | package.Commands.Add(newcon);
|
---|
125 | this.Controller.UndoManager.AddUndoCommand(package);
|
---|
126 |
|
---|
127 | //do it all
|
---|
128 | package.Redo();
|
---|
129 |
|
---|
130 | //reset highlight of the found connector
|
---|
131 | if (foundConnector != null)
|
---|
132 | foundConnector.Hovered = false;
|
---|
133 | //drop the painted ghost
|
---|
134 | Controller.View.ResetGhost();
|
---|
135 | this.doDraw = false;
|
---|
136 | }
|
---|
137 | }
|
---|
138 | #endregion
|
---|
139 | }
|
---|
140 |
|
---|
141 | }
|
---|