我要评论drawer 抽屉控件的实现
框架支持.net4 至 .net8；
visual studio 2022;
抽屉控件的逻辑实现
定义了一个名为 drawer 的自定义控件，继承自 headeredcontentcontrol，允许用户在应用程序中创建可展开和收起的抽屉。抽屉的显示和隐藏动画通过 storyboard 实现，支持从不同方向（左、上、右、下）展开和收起。
1.定义模板
使用 templatepart 特性定义了两个模板：borderheadertemplatename 和 bordermarktemplatename，分别代表抽屉的头和蒙板部分。
[templatepart(name = borderheadertemplatename, type = typeof(border))] [templatepart(name = bordermarktemplatename, type = typeof(border))] public class drawer : headeredcontentcontrol
2.定义依赖属性
position抽屉展开的方向（左、上、右、下）。isopen抽屉是否打开，状态变化时调用onisopenchanged方法。
public static readonly dependencyproperty edgepositionproperty =
dependencyproperty.register("position", typeof(position), typeof(drawer),
new propertymetadata(position.left));
public static readonly dependencyproperty isopenproperty =
dependencyproperty.register("isopen", typeof(bool), typeof(drawer),
new propertymetadata(false, onisopenchanged));
3.属性实现
public position position
{
get => (position) getvalue(edgepositionproperty);
set => setvalue(edgepositionproperty, value);
}
public bool isopen
{
get => (bool) getvalue(isopenproperty);
set => setvalue(isopenproperty, value);
}
4.状态变化处理
onisopenchanged 方法根据 isopen 属性的值，控制抽屉的显示或隐藏和动画效果。
private static void onisopenchanged(dependencyobject d, dependencypropertychangedeventargs e)
{
var ctrl = d as drawer;
if (ctrl != null)
{
if (ctrl.isopen)
{
ctrl._headerborder.visibility = visibility.visible;
ctrl._enterstoryboard.begin();
}
else
{
ctrl._exitstoryboard.begin();
}
}
}
5.模板应用
onapplytemplate 方法在控件模板应用时调用，获取模板中的 border 部件并注册 loaded 和 mousedown 事件。
public override void onapplytemplate()
{
base.onapplytemplate();
_headerborder = gettemplatechild(borderheadertemplatename) as border;
if (_headerborder != null)
_headerborder.loaded += headerborder_loaded;
_markborder = gettemplatechild(bordermarktemplatename) as border;
if (_markborder != null)
_markborder.mousedown += markborder_mousedown;
}
6.动画实现
headerborder_loaded 方法根据 position 的不同，设置不同的动画，并根据属性值控制动画的执行。
private void headerborder_loaded(object sender, routedeventargs e)
{
translatetransform translatetransform;
doubleanimation animation, exitanimation;
switch (position)
{
case position.left:
case position.right:
_headerwidth = _headerborder.actualwidth;
if (position == position.left)
translatetransform = new translatetransform(-_headerwidth, 0);
else
translatetransform = new translatetransform(_headerwidth, 0);
_headerborder.rendertransform = new transformgroup
{
children = new transformcollection {translatetransform}
};
animation = new doubleanimation
{
from = position == position.left ? -_headerwidth : _headerwidth,
to = 0,
duration = timespan.frommilliseconds(300)
};
storyboard.settarget(animation, _headerborder);
storyboard.settargetproperty(animation, new propertypath("rendertransform.children[0].x"));
_enterstoryboard = new storyboard();
_enterstoryboard.children.add(animation);
exitanimation = new doubleanimation
{
from = 0,
to = position == position.left ? -_headerwidth : _headerwidth,
duration = timespan.frommilliseconds(300)
};
storyboard.settarget(exitanimation, _headerborder);
storyboard.settargetproperty(exitanimation, new propertypath("rendertransform.children[0].x"));
_exitstoryboard = new storyboard();
_exitstoryboard.completed += delegate
{
if (!isopen)
_headerborder.visibility = visibility.collapsed;
};
_exitstoryboard.children.add(exitanimation);
break;
case position.top:
case position.bottom:
_headerheight = _headerborder.actualheight;
if (position == position.top)
translatetransform = new translatetransform(0, -_headerheight);
else
translatetransform = new translatetransform(0, _headerheight);
_headerborder.rendertransform = new transformgroup
{
children = new transformcollection {translatetransform}
};
animation = new doubleanimation
{
from = position == position.top ? -_headerheight : _headerheight,
to = 0,
duration = timespan.frommilliseconds(300)
};
storyboard.settarget(animation, _headerborder);
storyboard.settargetproperty(animation, new propertypath("rendertransform.children[0].y"));
_enterstoryboard = new storyboard();
_enterstoryboard.children.add(animation);
exitanimation = new doubleanimation
{
from = 0,
to = position == position.top ? -_headerheight : _headerheight,
duration = timespan.frommilliseconds(300)
};
storyboard.settarget(exitanimation, _headerborder);
storyboard.settargetproperty(exitanimation, new propertypath("rendertransform.children[0].y"));
_exitstoryboard = new storyboard();
_exitstoryboard.completed += delegate
{
if (!isopen)
_headerborder.visibility = visibility.collapsed;
};
_exitstoryboard.children.add(exitanimation);
break;
}
_headerborder.visibility = visibility.collapsed;
_headerborder.loaded -= headerborder_loaded;
}
抽屉控件的样式实现
position 属性的触发器：根据 position 属性的值（top、right、bottom），调整 part_header 的对齐方式。
isopen 属性的触发器：如果 isopen 为 false，将 part_mark 的可见性设置为 collapsed，在抽屉关闭时隐藏。
<style
x:key="wd.drawer"
basedon="{staticresource wd.controlbasicstyle}"
targettype="{x:type controls:drawer}">
<setter property="background" value="{dynamicresource wd.backgroundsolidcolorbrush}" />
<setter property="borderbrush" value="{dynamicresource wd.basesolidcolorbrush}" />
<setter property="borderthickness" value="1" />
<setter property="template">
<setter.value>
<controltemplate targettype="{x:type controls:drawer}">
<controls:wdborder
x:name="border"
margin="{templatebinding margin}"
background="{templatebinding background}"
borderbrush="{templatebinding borderbrush}"
borderthickness="{templatebinding borderthickness}"
cornerradius="{binding path=(helpers:elementhelper.cornerradius), relativesource={relativesource templatedparent}}"
snapstodevicepixels="true">
<controls:smallpanel clip="{binding relativesource={relativesource ancestortype=controls:wdborder}, path=contentclip}">
<border x:name="part_content">
<contentpresenter content="{templatebinding content}" />
</border>
<border
x:name="part_mark"
background="{dynamicresource wd.primarytextsolidcolorbrush}"
opacity=".5" />
<border
x:name="part_header"
horizontalalignment="left"
background="{templatebinding background}"
effect="{staticresource wd.normalshadowdepth}">
<contentpresenter content="{templatebinding header}" />
</border>
</controls:smallpanel>
</controls:wdborder>
<controltemplate.triggers>
<trigger property="position" value="top">
<setter targetname="part_header" property="horizontalalignment" value="stretch" />
<setter targetname="part_header" property="verticalalignment" value="top" />
</trigger>
<trigger property="position" value="right">
<setter targetname="part_header" property="horizontalalignment" value="right" />
<setter targetname="part_header" property="verticalalignment" value="stretch" />
</trigger>
<trigger property="position" value="bottom">
<setter targetname="part_header" property="horizontalalignment" value="stretch" />
<setter targetname="part_header" property="verticalalignment" value="bottom" />
</trigger>
<trigger property="isopen" value="false">
<setter targetname="part_mark" property="visibility" value="collapsed" />
</trigger>
</controltemplate.triggers>
</controltemplate>
</setter.value>
</setter>
</style>
示例
示例引入 wpfdevelopers 的 nuget包
<usercontrol
x:class="wpfdevelopers.samples.exampleviews.drawerexample"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:controls="clr-namespace:wpfdevelopers.samples.controls"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:wpfdevelopers.samples.exampleviews"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:wd="https://github.com/wpfdevelopersorg/wpfdevelopers"
d:designheight="450"
d:designwidth="800"
mc:ignorable="d">
<controls:codeviewer>
<grid>
<grid.columndefinitions>
<columndefinition />
<columndefinition />
</grid.columndefinitions>
<grid.rowdefinitions>
<rowdefinition />
<rowdefinition />
</grid.rowdefinitions>
<wd:drawer
x:name="mydrawertop"
margin="2"
position="top">
<wd:drawer.header>
<grid height="120">
<stackpanel horizontalalignment="center">
<textblock fontsize="18" text="drawer" />
<button horizontalalignment="center" content="contents..." />
</stackpanel>
</grid>
</wd:drawer.header>
<wd:drawer.content>
<stackpanel horizontalalignment="center" verticalalignment="bottom">
<textblock text="抽屉从顶部置滑出，点击遮罩区关闭。" />
<button
margin="0,10"
horizontalalignment="center"
click="buttontop_click"
content="open"
style="{staticresource wd.primarybutton}" />
</stackpanel>
</wd:drawer.content>
</wd:drawer>
<wd:drawer
x:name="mydrawerbottom"
grid.column="1"
margin="2"
wd:elementhelper.cornerradius="3"
position="bottom">
<wd:drawer.header>
<grid height="130">
<stackpanel horizontalalignment="center">
<textblock fontsize="18" text="drawer" />
<button
horizontalalignment="center"
wd:elementhelper.cornerradius="3"
content="contents..."
style="{staticresource wd.dangerdefaultbutton}" />
</stackpanel>
</grid>
</wd:drawer.header>
<wd:drawer.content>
<stackpanel horizontalalignment="center">
<textblock text="抽屉从底部滑出，点击遮罩区关闭。" />
<button
margin="0,10"
horizontalalignment="center"
wd:elementhelper.cornerradius="3"
click="buttonbottom_click"
content="open"
style="{staticresource wd.dangerprimarybutton}" />
</stackpanel>
</wd:drawer.content>
</wd:drawer>
<wd:drawer
x:name="mydrawerleft"
grid.row="1"
margin="2"
wd:elementhelper.cornerradius="3"
position="left">
<wd:drawer.header>
<grid width="140" background="hotpink">
<stackpanel>
<textblock
horizontalalignment="center"
fontsize="18"
text="drawer" />
<button
horizontalalignment="center"
wd:elementhelper.cornerradius="3"
content="contents..."
style="{staticresource wd.successdefaultbutton}" />
</stackpanel>
</grid>
</wd:drawer.header>
<wd:drawer.content>
<stackpanel horizontalalignment="center">
<textblock text="抽屉从左侧滑出，点击遮罩区关闭。" />
<button
margin="0,10"
horizontalalignment="center"
wd:elementhelper.cornerradius="3"
click="buttonleft_click"
content="open"
style="{staticresource wd.successprimarybutton}" />
</stackpanel>
</wd:drawer.content>
</wd:drawer>
<wd:drawer
x:name="mydrawerright"
grid.row="1"
grid.column="1"
margin="2"
position="right">
<wd:drawer.header>
<grid width="100">
<stackpanel horizontalalignment="center">
<textblock
horizontalalignment="center"
fontsize="18"
text="drawer" />
<button
horizontalalignment="center"
content="contents..."
style="{staticresource wd.warningdefaultbutton}" />
</stackpanel>
</grid>
</wd:drawer.header>
<wd:drawer.content>
<stackpanel horizontalalignment="center">
<textblock text="抽屉从右侧滑出，点击遮罩区关闭。" />
<button
margin="0,10"
horizontalalignment="center"
click="buttonright_click"
content="open"
style="{staticresource wd.warningprimarybutton}" />
</stackpanel>
</wd:drawer.content>
</wd:drawer>
</grid>
<controls:codeviewer.sourcecodes>
<controls:sourcecodemodel codesource="/wpfdevelopers.samplescode;component/exampleviews/drawerexample.xaml" codetype="xaml" />
<controls:sourcecodemodel codesource="/wpfdevelopers.samplescode;component/exampleviews/drawerexample.xaml.cs" codetype="csharp" />
</controls:codeviewer.sourcecodes>
</controls:codeviewer>
</usercontrol>效果图
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