1 前言
WORD 2013可以使用墨迹在文档上面标注，本文讲述通过WPF第三方控件实现类似主要功能如下：
| 名称 | 描述 |
| 墨迹标注 | 不论是否触摸屏环境下可以开始墨迹功能，并实现鼠标/触摸在文档任意位置绘制痕迹 |
| 墨迹痕迹保存 | 绘制的墨迹能够完整在word中保存 |
| 墨迹参数设置 | 设置墨迹的颜色和线条粗细 |
| 墨迹擦除 | 提供擦除工具，可以擦除已经绘制的墨迹 |
2 环境及三方组件
| 名称 | 描述 |
| DevExpress V16.2 | 使用其RichEditor控件作为word文档查看和编辑控件 |
| Aspose.Word | 在保存word文档时，调整墨迹痕迹的一些属性 |
| .NetFrameWork 4.5 | .net运行库环境 |
3 实现思路
首先来看一下word中如何开启墨迹。这个就要说微软不地道了，微软规定了只有在触摸屏的windows环境下才会默认显示墨迹按钮，使用鼠标的就默认不显示，当然我们也可以在选项中强制加上，然后没有啥用，因为使用鼠标的用户会发现“开始墨迹书写”按钮是灰色的，而触屏下是可用的，如下图。
我们先摒弃这个梗不说，为什么要自己开发一个墨迹功能呢，可能是因为office太贵了，一般客户买不起或者不想买，于是就要开发一个包含word基本功能的替代品，也有可能是我们开发软性时候需要集成word类似的功能，或者其他种种原因，所以还是决定自己开发(模仿)一个word的墨迹功能。废话少说，下面来一步一步的分析和设计墨迹功能实现思路。
首先，我找到一个在触摸屏上面写好一些文字的文档，在非触摸屏电脑上打开，选中墨迹，这时候工具栏中“图片”选项卡被激活了，可见所谓的“墨迹”实际上只是将手写痕迹保存为类似图片存储起来了，如下图。
总结一下，墨迹保存为图片的主要属性有这样：
1.允许重叠(好像默认插入图片是不允许重叠的)
2.绝对位置(应该是左上角的坐标位置吧)
3.浮于文字上方(这个肯定的，避免扰乱文字布局)
有了这些属性，我大胆设想如果我使用电子手写板插件，将手写痕迹保存下来，然后赋予这些属性，应该也可以达到墨迹的效果。
现在到了框架选型的阶段，首先我需要一个能够打开和编辑word的UI组件，然后我还需要一个电子手写板插件，最后将他们组合起来。这里我选择了DEV V1.6.2 的WPF版本和WPF的InkCanvas组件，这俩我都在实际中用过，比较熟悉。
打开DEV自带的Demo，很容易就看到了word的演示，代码也很简单，如下图。
下一步要做的就是将这个组件和InkCanvas结合起来，通过点击某个按钮触发InkCanvas覆盖到文档上面，然后再使用某个按钮事件触发将InkCanvas关闭或者隐藏掉，同时获取InkCanvas的痕迹保存为图片，再插入到文档指定位置就好了。详细实现代码参考第4部分。
4 主要代码
先看看UI部分的布局，将InkCanvas嵌入到Dev的word文档组件中。
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<
Grid
x:Name
=
"mainGrid"
>
<
dxre:RichEditControl
x:Name
=
"richEditControl1"
BarManager
=
"{Binding ElementName=barManager1, Mode=OneTime}"
Ribbon="{Binding
ElementName
=
ribbonControl1
,
Mode
=
OneTime
}"
MouseMove
=
"richEditControl1_MouseMove"
MouseLeave
=
"RichEditControl1_OnMouseLeave"
MouseUp
=
"richEditControl1_MouseUp"
/>
<
InkCanvas
x:Name
=
"mainCanvas"
Visibility
=
"Hidden"
>
<
InkCanvas.DefaultDrawingAttributes
>
<
DrawingAttributes
Color
=
"Red"
FitToCurve
=
"True"
Height
=
"4"
IgnorePressure
=
"False"
IsHighlighter
=
"False"
StylusTip
=
"Ellipse"
StylusTipTransform
=
"Identity"
Width
=
"4"
/>
</
InkCanvas.DefaultDrawingAttributes
>
<
InkCanvas.Background
>
<
SolidColorBrush
Color
=
"White"
Opacity
=
"0.01"
/>
</
InkCanvas.Background
>
</
InkCanvas
>
</
Grid
>
|
这一部分除了红框中的，其他的都是直接copy的DEV官方demo中的，红框的目的也是将手写板控件放置在文档内容页上面，默认是隐藏的，需要的时候再代码控制显示就好。
现在先弄俩按钮，“开始批注”和“停止批注”，来触发和停止墨迹功能。
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<
dxr:RibbonPage
x:Name
=
"penPage"
Caption
=
"批注"
>
<
dxr:RibbonPageGroup
x:Name
=
"penEvent"
Caption
=
"画笔"
ShowCaptionButton
=
"False"
>
<
dxb:BarButtonItem
x:Name
=
"startPenItem"
LargeGlyph
=
"pack://application:,,,/Resources/pen.png"
GlyphSize="L
arge"
Content
=
"开始批注"
/>
<
dxb:BarButtonItem
x:Name
=
"endPenItem"
LargeGlyph
=
"pack://application:,,,/Resources/pen_red.png"
GlyphSize="
Large"
Content
=
"停止批注"
IsEnabled
=
"False"
/>
<
dxb:BarButtonItem
x:Name
=
"eraserItem"
LargeGlyph
=
"pack://application:,,,/Resources/eraser.png"
GlyphSize="
Large"
Content
=
"擦除"
IsEnabled
=
"True"
/>
</
dxr:RibbonPageGroup
>
<
dxr:RibbonPageGroup
x:Name
=
"penSetting"
Caption
=
"画笔设置"
ShowCaptionButton
=
"False"
>
<
dxre:BarSplitButtonColorEditItem
x:Name
=
"penColor"
Content
=
"画笔颜色"
LargeGlyph="pack://application:,,,
/Resources/pallet.png"
RibbonStyle
=
"Large"
IsEnabled
=
"False"
>
<
dxb:PopupControlContainerInfo
>
<
dxe:ColorEdit
ChipSize
=
"Large"
Name
=
"penColorEdit"
ChipMargin
=
"5"
ColumnCount
=
"5"
ShowMoreColorsButton
=
"False"
ShowDefaultColorButton
=
"False"
ShowNoColorButton
=
"True"
ShowBorder
=
"False"
>
<
dxe:ColorEdit.Palettes
>
<
dxre:CharactersBackgroundColorPaletteCollection
/>
</
dxe:ColorEdit.Palettes
>
</
dxe:ColorEdit
>
</
dxb:PopupControlContainerInfo
>
</
dxre:BarSplitButtonColorEditItem
>
<
dxre:BarSplitButtonEditItem
x:Name
=
"penLine"
Content
=
"画笔线宽"
LargeGlyph
=
"Resources/penline.png"
IsEnab
led
=
"False"
>
<
dxb:PopupControlContainerInfo
x:Name
=
"cccc"
>
<
dxe:ListBoxEdit
Name
=
"penLineEdit"
ShowBorder
=
"False"
ShowCustomItems
=
"False"
>
<
dxe:ListBoxEditItem
Content
=
"1"
/>
<
dxe:ListBoxEditItem
Content
=
"2"
/>
<
dxe:ListBoxEditItem
Content
=
"3"
/>
<
dxe:ListBoxEditItem
Content
=
"4"
/>
<
dxe:ListBoxEditItem
Content
=
"5"
/>
<
dxe:ListBoxEditItem
Content
=
"6"
/>
<
dxe:ListBoxEditItem
Content
=
"7"
/>
<
dxe:ListBoxEditItem
Content
=
"8"
/>
<
dxe:ListBoxEditItem
Content
=
"9"
/>
<
dxe:ListBoxEditItem
Content
=
"10"
/>
<
dxe:ListBoxEditItem
Content
=
"12"
/>
<
dxe:ListBoxEditItem
Content
=
"14"
/>
</
dxe:ListBoxEdit
>
</
dxb:PopupControlContainerInfo
>
</
dxre:BarSplitButtonEditItem
>
</
dxr:RibbonPageGroup
>
</
dxr:RibbonPage
>
|
这个直接在界面上面增加一个“dxr:RibbonPage ”就可以了，里面增加对应的按钮和一些设置项目。
下面是开始批注代码。
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public
class
StartPenCommand : System.Windows.Input.ICommand
{
public
event
EventHandler CanExecuteChanged;
public
bool
CanExecute(
object
parameter)
{
return
true
;
}
public
void
Execute(
object
parameter)
{
MainWindow window = parameter
as
MainWindow;
window.StartPen(
true
);
}
}
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/// <summary>
/// 开始批注
/// </summary>
/// <param name="start"></param>
public
void
StartPen(
bool
start)
{
this
.richEditControl1.ActiveView.ZoomFactor = 1;
startPenItem.IsEnabled = !start;
endPenItem.IsEnabled = start;
eraserItem.IsEnabled = !start;
penColor.IsEnabled = start;
penLine.IsEnabled = start;
var
cursor=
new
Cursor(
new
MemoryStream(Resource.MetroBusy));
if
(!start)
this
.mainCanvas.Cursor = cursor;
this
.mainCanvas.Visibility = start ? Visibility.Visible : Visibility.Hidden;
}
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停止批注代码。
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public
class
EndPenCommand : System.Windows.Input.ICommand
{
public
event
EventHandler CanExecuteChanged;
public
bool
CanExecute(
object
parameter)
{
return
true
;
}
public
void
Execute(
object
parameter)
{
MainWindow window = parameter
as
MainWindow;
window.StartPen(
false
);
}
}
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然后是一个监听，在InkCanvas痕迹绘制就在对应文档增加一笔痕迹。
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//画笔绘制事件
this
.mainCanvas.StrokeCollected += (s, o) =>
{
Stroke item =
new
Stroke()
{
Color = lineColor,
LineWidth = lineWidth,
Points =
new
List<
float
[]>()
};
System.Windows.Ink.Stroke stroke = mainCanvas.Strokes[0];
for
(
int
i = 0; i < stroke.Clone().StylusPoints.Count; i++)
{
var
pt = stroke.StylusPoints[i];
item.Points.Add(
new
float
[2] { (
float
)pt.X, (
float
)pt.Y });
}
mainCanvas.Strokes.Clear();
DrawStroke(item);
};
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/// <summary>
/// 绘制痕迹
/// </summary>
/// <param name="stroke"></param>
private
void
DrawStroke(Stroke stroke)
{
if
(stroke.Points.Count < 3)
return
;
float
minX =
float
.MaxValue;
float
maxX = 0;
float
minY =
float
.MaxValue;
float
maxY = 0;
float
width = 0;
float
height = 0;
for
(
int
i = 0; i < stroke.Points.Count; i++)
{
var
pt = stroke.Points[i];
if
(pt[0] < minX)
minX = pt[0];
if
(pt[0] > maxX)
maxX = pt[0];
if
(pt[1] < minY)
minY = pt[1];
if
(pt[1] > maxY)
maxY = pt[1];
}
width = maxX - minX;
height = maxY - minY;
Bitmap bmp =
new
Bitmap((
int
)width + stroke.LineWidth+10, (
int
)height + stroke.LineWidth+10);
Graphics g = Graphics.FromImage(bmp);
g.SmoothingMode = SmoothingMode.HighQuality;
Pen pen =
new
Pen(System.Drawing.Color.FromArgb(255, stroke.Color.R, stroke.Color.G, stroke.Color.B),
stroke.LineWidth);
System.Drawing.PointF[] points =
new
System.Drawing.PointF[stroke.Points.Count];
for
(
int
i = 0; i < stroke.Points.Count; i++)
{
var
pt = stroke.Points[i];
//var pt2 = stroke.Points[i + 1];
var
x1 = (
float
)(pt[0] - minX + stroke.LineWidth);
var
y1 = (
float
)(pt[1] - minY + stroke.LineWidth);
//var x2 = (float)(pt2[0] - minX);
//var y2 = (float)(pt2[1] - minY);
//g.DrawLine(pen, x1, y1, x2, y2);
points[i] = (
new
PointF(x1, y1));
}
g.DrawCurve(pen, points);
//标注起点坐标
var
startPoint =
this
.mainCanvas.PointToScreen(
new
System.Windows.Point(minX, minY));
//标注起点坐标相对于文本控件的位置
var
editPoint =
this
.richEditControl1.PointFromScreen(startPoint);
//总页码
int
pageCount = ((DevExpress.XtraRichEdit.PageBasedRichEditView)richEditControl1.ActiveView).PageCount;
////是否有分页符
//bool hasPageBlock = false;
//for (int i = 0; i < pageCount; i++)
//{
// LayoutPage layoutPage = this.richEditControl1.DocumentLayout.GetPage(i);
// if (!hasPageBlock)
// {
// hasPageBlock = layoutPage.PageAreas.FirstOrDefault().Columns.Any(x => x.Rows.Any(y => y.Boxes.Any(z => z.Type == LayoutType.PageBreakBox)));
// break;
// }
//}
//获取当前可见页
var
pageInfos = richEditControl1.ActiveView.GetVisiblePageLayoutInfos();
foreach
(PageLayoutInfo pageInfo
in
pageInfos)
{
if
(pageInfo.Bounds.Y > (-1) * pageInfo.Bounds.Height)
{
//画笔起点是否在当前可见页
if
(editPoint.X >= pageInfo.Bounds.X && editPoint.X <= pageInfo.Bounds.X + pageInfo.Bounds.Width &&
editPoint.Y >= pageInfo.Bounds.Y && editPoint.Y <= pageInfo.Bounds.Y + pageInfo.Bounds.Height)
{
//当前可见页
int
pageIndex = pageInfo.PageIndex;
LayoutPage layoutPage =
this
.richEditControl1.DocumentLayout.GetPage(pageIndex);
DocumentPosition documentPosition;
if
(layoutPage.MainContentRange.Length == 1 && pageIndex == pageCount - 1)
{
//最后一页，且是分页符空白页
documentPosition =
this
.richEditControl1.Document.CreatePosition(
layoutPage.MainContentRange.Start + 1);
DocumentRange documentRange =
this
.richEditControl1.Document.CreateRange(documentPosition, 1);
this
.richEditControl1.Document.InsertDocumentContent(documentPosition, documentRange);
documentPosition = documentRange.End;
this
.richEditControl1.Document.Delete(documentRange);
}
else
{
documentPosition =
this
.richEditControl1.Document.CreatePosition(layoutPage.MainContentRange.Start +
layoutPage.MainContentRange.Length / 2);
}
//if (layoutPage.PageAreas.FirstOrDefault().Columns.Any(x => x.Rows.Any(y => y.Boxes.Any(z => z.Type == LayoutType.PageBreakBox))))
//if (this.richEditControl1.Document.HtmlText.Contains("cs1B16EEB5"))
/*if (hasPageBlock)
{
//有分页符
if (pageIndex >0)
{
LayoutPage preLayoutPage = this.richEditControl1.DocumentLayout.GetPage(pageIndex - 1);
if (
!preLayoutPage.PageAreas.FirstOrDefault().Columns.Any(x =>x.Rows.Any(y => y.Boxes.Any(z => z.Type == LayoutType.PageBreakBox))))
{
//前一页没有分页符
documentPosition =
this.richEditControl1.Document.CreatePosition(layoutPage.MainContentRange.Start);
}
else
{
//前一页有分页符
documentPosition =
this.richEditControl1.Document.CreatePosition(
layoutPage.MainContentRange.Start);
DocumentRange documentRange =
this.richEditControl1.Document.CreateRange(documentPosition, 1);
this.richEditControl1.Document.InsertDocumentContent(documentPosition, documentRange);
documentPosition = documentRange.End;
this.richEditControl1.Document.Delete(documentRange);
}
}
else
{
documentPosition =
this.richEditControl1.Document.CreatePosition(layoutPage.MainContentRange.Start);
}
//if (pageIndex == pageCount - 1)
//{
// //if (!layoutPage.PageAreas.FirstOrDefault().Columns.Any(x => x.Rows.Any(y => y.Boxes.Any(z=>z.Type ==
LayoutType.ParagraphMarkBox))))
// //{
// // DocumentRange documentRange = this.richEditControl1.Document.CreateRange(documentPosition, 1);
// // this.richEditControl1.Document.InsertDocumentContent(documentPosition, documentRange);
// // documentPosition = documentRange.End;
// // this.richEditControl1.Document.Delete(documentRange);
// //}
// documentPosition =
// this.richEditControl1.Document.CreatePosition(layoutPage.MainContentRange.Start +
//
layoutPage.MainContentRange.Length);
// DocumentRange documentRange =
// this.richEditControl1.Document.CreateRange(documentPosition, 1);
// this.richEditControl1.Document.InsertDocumentContent(documentPosition, documentRange);
// documentPosition = documentRange.End;
// this.richEditControl1.Document.Delete(documentRange);
//}
//else
//{
// documentPosition = this.richEditControl1.Document.CreatePosition(layoutPage.MainContentRange.Start);
//}
}
else
{
//无分页符
documentPosition = this.richEditControl1.Document.CreatePosition(layoutPage.MainContentRange.Start);
}*/
var
focusControl = richEditControl1.FocusElement;
var
controls = GetCanvasControls(focusControl);
//根据相对位置坐标绘制图片
foreach
(FrameworkElement box
in
controls)
{
Console.WriteLine(box.Name);
if
(box.Name ==
"SuperRoot"
)
{
if
(box.ActualHeight == 0)
{
}
else
{
Canvas canva = box
as
Canvas;
var
point = box.GetPosition(
this
.richEditControl1);
if
(point.Y > (-1) * canva.ActualHeight && point.Y < canva.ActualHeight)
{
try
{
System.Windows.Point gridPoint = canva.PointFromScreen(startPoint);
if
(gridPoint.Y < canva.ActualHeight && gridPoint.Y > 0 &&
gridPoint.X < canva.ActualWidth && gridPoint.X > 0)
{
Shape shape =
this
.richEditControl1.Document.InsertPicture(documentPosition, bmp);
shape.TextWrapping = TextWrappingType.InFrontOfText;
shape.HorizontalAlignment = ShapeHorizontalAlignment.None;
//shape.RelativeHorizontalPosition = ShapeRelativeHorizontalPosition.Column;
//shape.RelativeVerticalPosition = ShapeRelativeVerticalPosition.Paragraph;
shape.ZOrder = zIndex;
zIndex++;
shape.Name =
"penLink"
;
shape.Offset =
new
PointF((
float
)((gridPoint.X - stroke.LineWidth) * 3.12),
(
float
)((gridPoint.Y - stroke.LineWidth) * 3.12));
break
;
}
}
catch
(Exception ex)
{
}
}
}
}
}
break
;
}
}
}
}
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5 总结
最终实现效果如下图。
源码和更多资源请访问：http://88gis.cn/web/pages/blog/blogInfo.html?id=95e5139d-5dcc-4600-bcca-355ae6ac8a8f
