本文由網友投稿。
作者：竹天笑
原文標題：用 wpf 做一個思維導圖（續 3-diagram 畫板）
原文連結：https://www.cnblogs.com/akwkevin/p/17288814.html
先上一張簡易效果圖，本次更新主要仿照百度腦圖。
同样老规矩，先上源码地址：https://gitee.com/akwkevin/aistudio.-wpf.-diagram
本次擴展主要內容：
1. 思維導圖、目錄組織圖、魚骨頭圖、邏輯結構圖、組織結構圖，入口在文件新建下。
2. 思維導圖工具欄（只有思維導圖模式下可見）
2.1.插入連結
2.2.插入圖片
2.3.插入備註
2.4.插入優先級
2.5.插入進度
2.6.切換類型
2.7.切換主題
2.8.還要展開節點，全選，居中，適應窗體大小等功能，不再居間。
3. 添加搜索功能（不僅僅思維導圖可以使用）
4. 接下來居間下核心原始碼（布局設置）
思維導圖、目錄組織圖、魚骨頭圖、邏輯結構圖、組織結構圖的布局都繼承了以下接口：
public interface IMindLayout
{
/// <summary>
/// 默认节点样式设置
/// </summary>
/// <param name="mindNode"></param>
void Appearance(MindNode mindNode);
/// <summary>
/// 节点样式设置
/// </summary>
/// <param name="mindNode"></param>
/// <param name="mindTheme"></param>
/// <param name="initAppearance"></param>
void Appearance(MindNode mindNode, MindTheme mindTheme, bool initAppearance);
/// <summary>
/// 连线类型设置
/// </summary>
/// <param name="source"></param>
/// <param name="sink"></param>
/// <param name="connector"></param>
/// <returns></returns>
ConnectionViewModel GetOrSetConnectionViewModel(MindNode source, MindNode sink, ConnectionViewModel connector = null);
/// <summary>
/// 更新布局
/// </summary>
/// <param name="mindNode"></param>
void UpdatedLayout(MindNode mindNode);
}
其中：updatedlayout 包括布局丈量 measureoverride 和擺放元素 arrangeoverride，是不是感覺和重新 panel 差不多，先計算每個節點占的大小，然後開始布局。下面為思維導圖的原始碼，其他導圖的，如有興趣請下載原始碼查看。
public SizeBase MeasureOverride(MindNode mindNode, bool isExpanded = true)
{
var sizewithSpacing = mindNode.SizeWithSpacing;
if (mindNode.Children?.Count > 0)
{
if (mindNode.NodeLevel == 0)
{
var rights = mindNode.Children.Where((p, index) => index % 2 == 0).ToList();
rights.ForEach(p => p.ConnectorOrientation = ConnectorOrientation.Left);
var rightsizes = rights.Select(p => MeasureOverride(p, mindNode.IsExpanded && isExpanded)).ToArray();
var lefts = mindNode.Children.Where((p, index) => index % 2 == 1).ToList();
lefts.ForEach(p => p.ConnectorOrientation = ConnectorOrientation.Right);
var leftsizes = lefts.Select(p => MeasureOverride(p, mindNode.IsExpanded && isExpanded)).ToArray();
sizewithSpacing = new SizeBase(sizewithSpacing.Width + rightsizes.MaxOrDefault(p => p.Width) + +leftsizes.MaxOrDefault(p => p.Width), Math.Max(sizewithSpacing.Height, Math.Max(rightsizes.SumOrDefault(p => p.Height), leftsizes.SumOrDefault(p => p.Height))));
}
else
{
var childrensizes = mindNode.Children.Select(p => MeasureOverride(p, mindNode.IsExpanded && isExpanded)).ToArray();
sizewithSpacing = new SizeBase(sizewithSpacing.Width + childrensizes.MaxOrDefault(p => p.Width), Math.Max(sizewithSpacing.Height, childrensizes.SumOrDefault(p => p.Height)));
}
}
mindNode.DesiredSize = isExpanded ? sizewithSpacing : new SizeBase(0, 0);
mindNode.Visible = isExpanded;
return mindNode.DesiredSize;
}
public void ArrangeOverride(MindNode mindNode)
{
if (mindNode.NodeLevel == 0)
{
mindNode.DesiredPosition = mindNode.Position;
if (mindNode.Children?.Count > 0)
{
var rights = mindNode.Children.Where(p => p.ConnectorOrientation == ConnectorOrientation.Left).ToList();
double left = mindNode.DesiredPosition.X + mindNode.ItemWidth + mindNode.Spacing.Width;
double lefttop = mindNode.DesiredPosition.Y + mindNode.ItemHeight / 2 - Math.Min(mindNode.DesiredSize.Height, rights.SumOrDefault(p => p.DesiredSize.Height)) / 2;
foreach (var child in rights)
{
child.Offset = new PointBase(child.Offset.X - child.RootNode.Offset.X, child.Offset.Y - child.RootNode.Offset.Y);
child.DesiredPosition = new PointBase(left + child.Spacing.Width, lefttop + child.DesiredSize.Height / 2 - child.ItemHeight / 2);
child.Left = child.DesiredPosition.X + child.Offset.X;
child.Top = child.DesiredPosition.Y + child.Offset.Y;
lefttop += child.DesiredSize.Height;
ArrangeOverride(child);
var connector = mindNode.Root?.Items.OfType<ConnectionViewModel>().FirstOrDefault(p => p.SourceConnectorInfo?.DataItem == mindNode && p.SinkConnectorInfoFully?.DataItem == child);
connector?.SetSourcePort(mindNode.FirstConnector);
connector?.SetSinkPort(child.LeftConnector);
connector?.SetVisible(child.Visible);
}
var lefts = mindNode.Children.Where(p => p.ConnectorOrientation == ConnectorOrientation.Right).ToList();
double right = mindNode.DesiredPosition.X - mindNode.Spacing.Width;
double righttop = mindNode.DesiredPosition.Y + mindNode.ItemHeight / 2 - Math.Min(mindNode.DesiredSize.Height, lefts.SumOrDefault(p => p.DesiredSize.Height)) / 2;
foreach (var child in lefts)
{
child.Offset = new PointBase(child.Offset.X - child.RootNode.Offset.X, child.Offset.Y - child.RootNode.Offset.Y);
child.DesiredPosition = new PointBase(right - child.Spacing.Width - child.ItemWidth, righttop + child.DesiredSize.Height / 2 - child.ItemHeight / 2);
child.Left = child.DesiredPosition.X + child.Offset.X;
child.Top = child.DesiredPosition.Y + child.Offset.Y;
righttop += child.DesiredSize.Height;
ArrangeOverride(child);
var connector = mindNode.Root?.Items.OfType<ConnectionViewModel>().FirstOrDefault(p => p.SourceConnectorInfo?.DataItem == mindNode && p.SinkConnectorInfoFully?.DataItem == child);
connector?.SetSourcePort(mindNode.FirstConnector);
connector?.SetSinkPort(child.RightConnector);
connector?.SetVisible(child.Visible);
}
}
mindNode.Offset = new PointBase();//修正后归0
}
else
{
if (mindNode.GetLevel1Node().ConnectorOrientation == ConnectorOrientation.Left)
{
double left = mindNode.DesiredPosition.X + mindNode.ItemWidth + mindNode.Spacing.Width;
double top = mindNode.DesiredPosition.Y + mindNode.ItemHeight / 2 - Math.Min(mindNode.DesiredSize.Height, mindNode.Children.SumOrDefault(p => p.DesiredSize.Height)) / 2;
if (mindNode.Children?.Count > 0)
{
foreach (var child in mindNode.Children)
{
child.Offset = new PointBase(child.Offset.X - child.RootNode.Offset.X, child.Offset.Y - child.RootNode.Offset.Y);
child.DesiredPosition = new PointBase(left + child.Spacing.Width, top + child.DesiredSize.Height / 2 - child.ItemHeight / 2);
child.Left = child.DesiredPosition.X + child.Offset.X;
child.Top = child.DesiredPosition.Y + child.Offset.Y;
top += child.DesiredSize.Height;
ArrangeOverride(child);
var connector = mindNode.Root?.Items.OfType<ConnectionViewModel>().FirstOrDefault(p => p.SourceConnectorInfo?.DataItem == mindNode && p.SinkConnectorInfoFully?.DataItem == child);
connector?.SetSourcePort(mindNode.RightConnector);
connector?.SetSinkPort(child.LeftConnector);
connector?.SetVisible(child.Visible);
}
}
}
else
{
double right = mindNode.DesiredPosition.X - mindNode.Spacing.Width;
double top = mindNode.DesiredPosition.Y + mindNode.ItemHeight / 2 - Math.Min(mindNode.DesiredSize.Height, mindNode.Children.SumOrDefault(p => p.DesiredSize.Height)) / 2;
if (mindNode.Children?.Count > 0)
{
foreach (var child in mindNode.Children)
{
child.Offset = new PointBase(child.Offset.X - child.RootNode.Offset.X, child.Offset.Y - child.RootNode.Offset.Y);
child.DesiredPosition = new PointBase(right - child.Spacing.Width - child.ItemWidth, top + child.DesiredSize.Height / 2 - child.ItemHeight / 2);
child.Left = child.DesiredPosition.X + child.Offset.X;
child.Top = child.DesiredPosition.Y + child.Offset.Y;
top += child.DesiredSize.Height;
ArrangeOverride(child);
var connector = mindNode.Root?.Items.OfType<ConnectionViewModel>().FirstOrDefault(p => p.SourceConnectorInfo?.DataItem == mindNode && p.SinkConnectorInfoFully?.DataItem == child);
connector?.SetSourcePort(mindNode.LeftConnector);
connector?.SetSinkPort(child.RightConnector);
connector?.SetVisible(child.Visible);
}
}
}
}
}
5. 最后为了方便大家使用，我封装了一个思维脑图的控件 MindEditor，可以直接绑定 json 格式的数据，数据改变，可以直接加载应用。（见AIStudio.Wpf.DiagramDesigner.Demo）
近期会持续更新，欢迎大家光临艾竹 (akwkevin) - Gitee.com，支持的朋友们，点个小星星，你们的支持能燃烧我开源的力量。