1 | using System;
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2 | using System.Collections;
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3 | using System.Collections.Generic;
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4 | using System.Diagnostics;
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5 | namespace Netron.Diagramming.Core {
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6 | /// <summary>
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7 | /// Send forward tool which moves the selection up in the z-order.
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8 | /// </summary>
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9 | class SendForwardsTool : AbstractTool {
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10 |
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11 | #region Fields
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12 |
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13 | #endregion
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14 |
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15 | #region Constructor
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16 | /// <summary>
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17 | /// Initializes a new instance of the <see cref="T:SendBackwards"/> class.
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18 | /// </summary>
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19 | /// <param name="name">The name of the tool.</param>
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20 | public SendForwardsTool(string name)
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21 | : base(name) {
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22 | }
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23 | #endregion
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24 |
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25 | #region Methods
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26 |
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27 | /// <summary>
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28 | /// Called when the tool is activated.
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29 | /// </summary>
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30 | protected override void OnActivateTool() {
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31 | /*
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32 | * A lot of stuff is calculated here for something which might seem at first sight
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33 | * a really simple action. In general the calculations will be short since a user does not
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34 | * usually shift many shapes at the same time and the overlap with the selection
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35 | * is small.
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36 | */
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37 | if (this.Controller.Model.Selection.SelectedItems != null && this.Controller.Model.Selection.SelectedItems.Count > 0) {
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38 |
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39 | /*
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40 | * They should give me a Nobel prize for so much thinking early in the morning...
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41 | */
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42 | #region Preparation of the ordering
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43 | Debug.Assert(this.Controller.Model.Selection.SelectedItems[0] != null, "A selection cannot contain a 'null' entity.");
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44 | //the items have to be moved in the order of the Paintables; the SortedList automatically orders things for us.
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45 | SortedList<int, IDiagramEntity> list = new SortedList<int, IDiagramEntity>();
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46 | //We fetch a flattened selection, which means that if there is a group the constituents will be
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47 | //returned rather than the group itself.
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48 | foreach (IDiagramEntity entity in this.Controller.Model.Selection.FlattenedSelectionItems) {
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49 | //the addition will automatically put the item in increasing order
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50 | list.Add(this.Controller.Model.Paintables.IndexOf(entity), entity);
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51 | }
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52 | //if the highest z-value is the last one in the paintables we cannot shift anything, so we quit
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53 | if (list.Keys[list.Count - 1] == this.Controller.Model.Paintables.Count - 1) return;
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54 |
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55 | /*Send them forwards but make sure it's a visible effect!
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56 | It's not enough to move it only once since the shape(s) above might be of
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57 | high z-order degree, so we have to find which is the first shape overlapping with
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58 | the selection and take as many steps as it takes to surpass it.
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59 | If there is no overlap we'll shift the z-order with just one unit.
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60 | */
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61 | int delta = 1;
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62 | int lowestZInSelection = list.Keys[0];
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63 | bool found = false;
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64 | //we can speed up the loop by noticing that the next shape in the z-stack is necessarily
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65 | //above the first one of the selection
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66 | for (int m = lowestZInSelection + 1; m < this.Controller.Model.Paintables.Count && !found; m++) {
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67 | //the overlap has to be with an entity, not from the selection
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68 | if (list.ContainsValue(this.Controller.Model.Paintables[m])) continue;
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69 | for (int s = 0; s < list.Count; s++) {
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70 | //if there is an overlap we found the required index
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71 | if (this.Controller.Model.Paintables[m].Rectangle.IntersectsWith(list.Values[s].Rectangle)) {
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72 | //an additional complication here; if the found shape is part of a group we have
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73 | //to take the upper z-value of the group...
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74 | if (this.Controller.Model.Paintables[m].Group != null) {
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75 | int max = -1;
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76 | CollectionBase<IDiagramEntity> leafs = new CollectionBase<IDiagramEntity>();
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77 | Utils.TraverseCollect(this.Controller.Model.Paintables[m].Group, ref leafs);
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78 | foreach (IDiagramEntity groupMember in leafs) {
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79 | max = Math.Max(max, this.Controller.Model.Paintables.IndexOf(groupMember));
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80 | }
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81 | //take the found z-value of the group rather than the one of the group-child
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82 | m = max;
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83 | }
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84 | delta = m - lowestZInSelection;
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85 | found = true;
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86 | break;
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87 | }
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88 |
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89 | }
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90 | }
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91 | #endregion
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92 | Debug.Assert(delta >= 1, "The shift cannot be less than one since we checked previous situations earlier.");
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93 | for (int k = 0; k < list.Count; k++) {
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94 | this.Controller.Model.SendForwards(list.Values[k], delta);
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95 | }
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96 | }
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97 | DeactivateTool();
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98 | }
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99 |
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100 | #endregion
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101 |
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102 |
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103 | }
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104 |
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105 | }
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