源码版本：paint.net 3.36 (https://github.com/rivy/OpenPDN), 后续的版本貌似不提供源码了
重要的几个工程目录：
Base: 基础数据结构, 和项目无关，例如Pair，Tuple，Set，EventArgs等
Core：和项目相关的数据结构，例如RendreArgs，Surface，Histogram，HsvColor
Data：项目文件类型，例如PdnFileType，JpegFileType等
paintdotnet：主入口，主逻辑
Effect：滤镜
SystemLayer：和系统相关, 例如ThreadBackground, Memory等，不是图层的Layer
Resource：cursor，icon，image等
启动入口：Startup类1
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40StartPart2
{
Application.Run(this.mainForm);
}
internal sealed class MainForm: PdnBaseForm
{
private AppWorkspace appWorkspace;
private void InitializeComponent()
{
this.components = new System.ComponentModel.Container();
this.defaultButton = new System.Windows.Forms.Button();
// 构造
this.appWorkspace = new PaintDotNet.AppWorkspace();
this.floaterOpacityTimer = new System.Windows.Forms.Timer(this.components);
this.deferredInitializationTimer = new System.Windows.Forms.Timer(this.components);
this.SuspendLayout();
//
// appWorkspace
//
this.appWorkspace.Dock = System.Windows.Forms.DockStyle.Fill;
this.appWorkspace.Location = new System.Drawing.Point(0, 0);
this.appWorkspace.Name = "appWorkspace";
this.appWorkspace.Size = new System.Drawing.Size(752, 648);
this.appWorkspace.TabIndex = 2;
this.appWorkspace.ActiveDocumentWorkspaceChanging += new EventHandler(AppWorkspace_ActiveDocumentWorkspaceChanging);
this.appWorkspace.ActiveDocumentWorkspaceChanged += new EventHandler(AppWorkspace_ActiveDocumentWorkspaceChanged);
//...
this.AutoScaleDimensions = new SizeF(96F, 96F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Dpi;
this.ClientSize = new System.Drawing.Size(950, 738);
// 添加appWorkspace
this.Controls.Add(this.appWorkspace);
this.Controls.Add(this.defaultButton);
//...
}
}
AppWorkspace非常关键, 代码如下1
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171internal class AppWorkspace: UserControl, ISnapObstacleHost
{
private AppEnvironment appEnvironment;
private DocumentWorkspace activeDocumentWorkspace;
// if a new workspace is added, and this workspace is not dirty, then it will be removed.
// This keeps track of the last workspace added via CreateBlankDocumentInNewWorkspace (if
// true was passed for its 2nd parameter)
private DocumentWorkspace initialWorkspace;
private List<DocumentWorkspace> documentWorkspaces = new List<DocumentWorkspace>();
private WorkspaceWidgets widgets;
//状态栏, 工具条, 悬浮窗
private Panel workspacePanel;
private PdnToolBar toolBar;
private PdnStatusBar statusBar;
private ToolsForm mainToolBarForm;
private LayerForm layerForm;
private HistoryForm historyForm;
private ColorsForm colorsForm;
//...
public AppWorkspace()
{
SuspendLayout();
// initialize!
InitializeComponent();
InitializeFloatingForms();
this.mainToolBarForm.ToolsControl.SetTools(DocumentWorkspace.ToolInfos);
this.mainToolBarForm.ToolsControl.ToolClicked += new ToolClickedEventHandler(this.MainToolBar_ToolClicked);
this.toolBar.ToolChooserStrip.SetTools(DocumentWorkspace.ToolInfos);
this.toolBar.ToolChooserStrip.ToolClicked += new ToolClickedEventHandler(this.MainToolBar_ToolClicked);
this.toolBar.AppWorkspace = this;
// init the Widgets container
this.widgets = new WorkspaceWidgets(this);
this.widgets.ViewConfigStrip = this.toolBar.ViewConfigStrip;
this.widgets.CommonActionsStrip = this.toolBar.CommonActionsStrip;
this.widgets.ToolConfigStrip = this.toolBar.ToolConfigStrip;
this.widgets.ToolsForm = this.mainToolBarForm;
this.widgets.LayerForm = this.layerForm;
this.widgets.HistoryForm = this.historyForm;
this.widgets.ColorsForm = this.colorsForm;
this.widgets.StatusBarProgress = this.statusBar;
this.widgets.DocumentStrip = this.toolBar.DocumentStrip;
// Load our settings and initialize the AppEnvironment
LoadSettings();
// hook into Environment *Changed events
AppEnvironment.PrimaryColorChanged += PrimaryColorChangedHandler;
AppEnvironment.SecondaryColorChanged += SecondaryColorChangedHandler;
AppEnvironment.ShapeDrawTypeChanged += ShapeDrawTypeChangedHandler;
AppEnvironment.GradientInfoChanged += GradientInfoChangedHandler;
AppEnvironment.ToleranceChanged += OnEnvironmentToleranceChanged;
AppEnvironment.AlphaBlendingChanged += AlphaBlendingChangedHandler;
AppEnvironment.FontInfo = this.toolBar.ToolConfigStrip.FontInfo;
AppEnvironment.TextAlignment = this.toolBar.ToolConfigStrip.FontAlignment;
AppEnvironment.AntiAliasingChanged += Environment_AntiAliasingChanged;
AppEnvironment.FontInfoChanged += Environment_FontInfoChanged;
AppEnvironment.FontSmoothingChanged += Environment_FontSmoothingChanged;
AppEnvironment.TextAlignmentChanged += Environment_TextAlignmentChanged;
AppEnvironment.PenInfoChanged += Environment_PenInfoChanged;
AppEnvironment.BrushInfoChanged += Environment_BrushInfoChanged;
AppEnvironment.ColorPickerClickBehaviorChanged += Environment_ColorPickerClickBehaviorChanged;
AppEnvironment.ResamplingAlgorithmChanged += Environment_ResamplingAlgorithmChanged;
AppEnvironment.SelectionCombineModeChanged += Environment_SelectionCombineModeChanged;
AppEnvironment.FloodModeChanged += Environment_FloodModeChanged;
AppEnvironment.SelectionDrawModeInfoChanged += Environment_SelectionDrawModeInfoChanged;
this.toolBar.DocumentStrip.RelinquishFocus += RelinquishFocusHandler;
this.toolBar.ToolConfigStrip.ToleranceChanged += OnToolBarToleranceChanged;
this.toolBar.ToolConfigStrip.FontAlignmentChanged += ToolConfigStrip_TextAlignmentChanged;
this.toolBar.ToolConfigStrip.FontInfoChanged += ToolConfigStrip_FontTextChanged;
this.toolBar.ToolConfigStrip.FontSmoothingChanged += ToolConfigStrip_FontSmoothingChanged;
this.toolBar.ToolConfigStrip.RelinquishFocus += RelinquishFocusHandler2;
this.toolBar.CommonActionsStrip.RelinquishFocus += OnToolStripRelinquishFocus;
this.toolBar.CommonActionsStrip.MouseWheel += OnToolStripMouseWheel;
this.toolBar.CommonActionsStrip.ButtonClick += CommonActionsStrip_ButtonClick;
this.toolBar.ViewConfigStrip.DrawGridChanged += ViewConfigStrip_DrawGridChanged;
this.toolBar.ViewConfigStrip.RulersEnabledChanged += ViewConfigStrip_RulersEnabledChanged;
this.toolBar.ViewConfigStrip.ZoomBasisChanged += ViewConfigStrip_ZoomBasisChanged;
this.toolBar.ViewConfigStrip.ZoomScaleChanged += ViewConfigStrip_ZoomScaleChanged;
this.toolBar.ViewConfigStrip.ZoomIn += ViewConfigStrip_ZoomIn;
this.toolBar.ViewConfigStrip.ZoomOut += ViewConfigStrip_ZoomOut;
this.toolBar.ViewConfigStrip.UnitsChanged += ViewConfigStrip_UnitsChanged;
this.toolBar.ViewConfigStrip.RelinquishFocus += OnToolStripRelinquishFocus;
this.toolBar.ViewConfigStrip.MouseWheel += OnToolStripMouseWheel;
this.toolBar.ToolConfigStrip.BrushInfoChanged += DrawConfigStrip_BrushChanged;
this.toolBar.ToolConfigStrip.ShapeDrawTypeChanged += DrawConfigStrip_ShapeDrawTypeChanged;
this.toolBar.ToolConfigStrip.PenInfoChanged += DrawConfigStrip_PenChanged;
this.toolBar.ToolConfigStrip.GradientInfoChanged += ToolConfigStrip_GradientInfoChanged;
this.toolBar.ToolConfigStrip.AlphaBlendingChanged += OnDrawConfigStripAlphaBlendingChanged;
this.toolBar.ToolConfigStrip.AntiAliasingChanged += DrawConfigStrip_AntiAliasingChanged;
this.toolBar.ToolConfigStrip.RelinquishFocus += OnToolStripRelinquishFocus;
this.toolBar.ToolConfigStrip.ColorPickerClickBehaviorChanged += ToolConfigStrip_ColorPickerClickBehaviorChanged;
this.toolBar.ToolConfigStrip.ResamplingAlgorithmChanged += ToolConfigStrip_ResamplingAlgorithmChanged;
this.toolBar.ToolConfigStrip.SelectionCombineModeChanged += ToolConfigStrip_SelectionCombineModeChanged;
this.toolBar.ToolConfigStrip.FloodModeChanged += ToolConfigStrip_FloodModeChanged;
this.toolBar.ToolConfigStrip.SelectionDrawModeInfoChanged += ToolConfigStrip_SelectionDrawModeInfoChanged;
this.toolBar.ToolConfigStrip.SelectionDrawModeUnitsChanging += ToolConfigStrip_SelectionDrawModeUnitsChanging;
this.toolBar.ToolConfigStrip.MouseWheel += OnToolStripMouseWheel;
this.toolBar.DocumentStrip.RelinquishFocus += OnToolStripRelinquishFocus;
this.toolBar.DocumentStrip.DocumentClicked += DocumentStrip_DocumentTabClicked;
this.toolBar.DocumentStrip.DocumentListChanged += DocumentStrip_DocumentListChanged;
// Synchronize
AppEnvironment.PerformAllChanged();
this.globalToolTypeChoice = this.defaultToolTypeChoice;
this.toolBar.ToolConfigStrip.ToolBarConfigItems = ToolBarConfigItems.None;
this.layerForm.LayerControl.AppWorkspace = this;
ResumeLayout();
PerformLayout();
}
private void InitializeFloatingForms()
{
// MainToolBarForm
mainToolBarForm = new ToolsForm();
mainToolBarForm.RelinquishFocus += RelinquishFocusHandler;
mainToolBarForm.ProcessCmdKeyEvent += OnToolFormProcessCmdKeyEvent;
// LayerForm
layerForm = new LayerForm();
layerForm.LayerControl.AppWorkspace = this;
layerForm.LayerControl.ClickedOnLayer += LayerControl_ClickedOnLayer;
layerForm.NewLayerButtonClick += LayerForm_NewLayerButtonClicked;
layerForm.DeleteLayerButtonClick += LayerForm_DeleteLayerButtonClicked;
layerForm.DuplicateLayerButtonClick += LayerForm_DuplicateLayerButtonClick;
layerForm.MergeLayerDownClick += new EventHandler(LayerForm_MergeLayerDownClick);
layerForm.MoveLayerUpButtonClick += LayerForm_MoveLayerUpButtonClicked;
layerForm.MoveLayerDownButtonClick += LayerForm_MoveLayerDownButtonClicked;
layerForm.PropertiesButtonClick += LayerForm_PropertiesButtonClick;
layerForm.RelinquishFocus += RelinquishFocusHandler;
layerForm.ProcessCmdKeyEvent += OnToolFormProcessCmdKeyEvent;
// HistoryForm
historyForm = new HistoryForm();
historyForm.RewindButtonClicked += HistoryForm_RewindButtonClicked;
historyForm.UndoButtonClicked += HistoryForm_UndoButtonClicked;
historyForm.RedoButtonClicked += HistoryForm_RedoButtonClicked;
historyForm.FastForwardButtonClicked += HistoryForm_FastForwardButtonClicked;
historyForm.RelinquishFocus += RelinquishFocusHandler;
historyForm.ProcessCmdKeyEvent += OnToolFormProcessCmdKeyEvent;
// ColorsForm
colorsForm = new ColorsForm();
colorsForm.PaletteCollection = new PaletteCollection();
colorsForm.WhichUserColor = WhichUserColor.Primary;
colorsForm.UserPrimaryColorChanged += ColorsForm_UserPrimaryColorChanged;
colorsForm.UserSecondaryColorChanged += ColorsForm_UserSecondaryColorChanged;
colorsForm.RelinquishFocus += RelinquishFocusHandler;
colorsForm.ProcessCmdKeyEvent += OnToolFormProcessCmdKeyEvent;
}
}
下图是Paint.Net的UI界面
是个悬浮窗分别是ToolsForm, LayerForm, HistoryForm, ColorsForm. 中间图像所在区域可以理解为DocumentWorkspace. 由于可以打开多张图像, 所以存在一个DocumentWorkspace列表. 当前正在处理的是activeDocumentWorkspace. 另外还有一个WorkspaceWidgets, 代码中将layerForm, historyForm, colorsForm, mainToolBarForm都赋值给了它