[2768] | 1 | using System;
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| 2 | using System.Drawing;
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| 3 | using System.Windows.Forms;
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| 4 |
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[2861] | 5 | namespace Netron.Diagramming.Core {
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[2768] | 6 |
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[2861] | 7 | class ConnectionTool : AbstractTool, IMouseListener {
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[2768] | 8 |
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[2861] | 9 | #region Fields
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| 10 | /// <summary>
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| 11 | /// the location of the mouse when the motion starts
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| 12 | /// </summary>
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| 13 | private Point initialPoint;
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| 14 | private bool doDraw;
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| 15 | #endregion
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[2768] | 16 |
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[2861] | 17 | #region Constructor
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| 18 | /// <summary>
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| 19 | /// Initializes a new instance of the <see cref="T:ConnectionTool"/> class.
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| 20 | /// </summary>
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| 21 | /// <param name="name">The name of the tool.</param>
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| 22 | public ConnectionTool(string name)
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| 23 | : base(name) {
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| 24 | }
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| 25 | #endregion
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[2768] | 26 |
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[2861] | 27 | #region Methods
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[2768] | 28 |
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[2861] | 29 | /// <summary>
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| 30 | /// Called when the tool is activated.
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| 31 | /// </summary>
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| 32 | protected override void OnActivateTool() {
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| 33 | Controller.View.CurrentCursor = CursorPalette.Grip;
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| 34 | this.SuspendOtherTools();
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| 35 | doDraw = false;
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| 36 | }
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[2768] | 37 |
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[2861] | 38 | /// <summary>
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| 39 | /// Handles the mouse down event
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| 40 | /// </summary>
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| 41 | /// <param name="e">The <see cref="T:System.Windows.Forms.MouseEventArgs"/> instance containing the event data.</param>
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| 42 | /// <returns>Returns 'true' if the event was handled, otherwise 'false'.</returns>
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| 43 | public bool MouseDown(MouseEventArgs e) {
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| 44 | if (e == null)
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| 45 | throw new ArgumentNullException("The argument object is 'null'");
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| 46 | if (e.Button == MouseButtons.Left && Enabled && !IsSuspended) {
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[2768] | 47 |
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[2861] | 48 | initialPoint = e.Location;
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| 49 | doDraw = true;
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| 50 | return true;
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| 51 | }
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| 52 | return false;
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| 53 | }
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[2768] | 54 |
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[2861] | 55 | /// <summary>
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| 56 | /// Handles the mouse move event
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| 57 | /// </summary>
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| 58 | /// <param name="e">The <see cref="T:System.Windows.Forms.MouseEventArgs"/> instance containing the event data.</param>
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| 59 | public void MouseMove(MouseEventArgs e) {
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| 60 | if (e == null)
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| 61 | throw new ArgumentNullException("The argument object is 'null'");
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| 62 | Point point = e.Location;
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| 63 | if (IsActive) {
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| 64 | if (foundConnector != null)
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| 65 | foundConnector.Hovered = false;
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[2868] | 66 | foundConnector = this.Controller.Model.Selection.FindConnectorAt(e.Location);
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[2861] | 67 | if (foundConnector != null)
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| 68 | foundConnector.Hovered = true;
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| 69 | }
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| 70 | if (IsActive && doDraw) {
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| 71 | Controller.View.PaintGhostLine(initialPoint, point);
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| 72 | Controller.View.Invalidate(System.Drawing.Rectangle.Inflate(Controller.View.Ghost.Rectangle, 20, 20));
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[2768] | 73 |
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| 74 |
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[2861] | 75 | }
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| 76 | }
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| 77 | private IConnector foundConnector;
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| 78 | /// <summary>
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| 79 | ///
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| 80 | /// </summary>
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| 81 | /// <param name="e">The <see cref="T:System.Windows.Forms.MouseEventArgs"/> instance containing the event data.</param>
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| 82 | public void MouseUp(MouseEventArgs e) {
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| 83 | if (IsActive) {
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| 84 | // First, make sure the initial point is far enough away from
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| 85 | // the final point to make a connection.
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| 86 | int maxX = Math.Abs(Math.Max(initialPoint.X, e.Location.X));
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| 87 | int maxY = Math.Abs(Math.Max(initialPoint.Y, e.Location.Y));
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[2768] | 88 |
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[2861] | 89 | if (!(maxX > ConnectionBase.MinLength) ||
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| 90 | !(maxY > ConnectionBase.MinLength)) {
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| 91 | return;
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| 92 | }
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[2768] | 93 |
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[2861] | 94 | //whatever comes hereafter, a compund command is the most economic approach
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| 95 | CompoundCommand package = new CompoundCommand(this.Controller);
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| 96 |
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| 97 | //let's see if the connection endpoints hit other connectors
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| 98 | //note that the following can be done because the actual connection has not been created yet
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| 99 | //otherwise the search would find the endpoints of the newly created connection, which
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| 100 | //would create a loop and a stack overflow!
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[2868] | 101 | IConnector startConnector = this.Controller.Model.Selection.FindConnectorAt(initialPoint);
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| 102 | IConnector endConnector = this.Controller.Model.Selection.FindConnectorAt(e.Location);
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[2861] | 103 |
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| 104 | #region Create the new connection
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| 105 | Connection cn = new Connection(this.initialPoint, e.Location, this.Controller.Model);
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| 106 | AddConnectionCommand newcon = new AddConnectionCommand(this.Controller, cn);
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| 107 |
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| 108 | #endregion
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| 109 |
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| 110 | #region Initial attachment?
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| 111 | if (startConnector != null) {
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| 112 | BindConnectorsCommand bindStart = new BindConnectorsCommand(this.Controller, startConnector, cn.From);
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| 113 | package.Commands.Add(bindStart);
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[2768] | 114 | }
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| 115 | #endregion
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[2861] | 116 |
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| 117 | #region Final attachment?
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| 118 | if (endConnector != null) {
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| 119 | BindConnectorsCommand bindEnd = new BindConnectorsCommand(this.Controller, endConnector, cn.To);
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| 120 | package.Commands.Add(bindEnd);
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| 121 | }
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| 122 | #endregion
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| 123 | package.Text = "New connection";
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| 124 | package.Commands.Add(newcon);
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| 125 | this.Controller.UndoManager.AddUndoCommand(package);
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| 126 |
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| 127 | //do it all
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| 128 | package.Redo();
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| 129 |
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| 130 | //reset highlight of the found connector
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| 131 | if (foundConnector != null)
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| 132 | foundConnector.Hovered = false;
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| 133 | //drop the painted ghost
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| 134 | Controller.View.ResetGhost();
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[2901] | 135 | this.doDraw = false;
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[2861] | 136 | }
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[2768] | 137 | }
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[2861] | 138 | #endregion
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| 139 | }
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[2768] | 140 |
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| 141 | }
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