WPF 动态添加控件以及样式字典的引用(Style introduction)

程序员文章站 2022-03-22 14:34:58

我们想要达到的结果是，绑定多个Checkbox然后我们还可以获取它是否被选中，其实很简单，我们只要找到那几个关键的对象就可以了。下面是Ui,其中定义了一个WrapPanel来存放CheckBox，还有两个按钮，用于测试相关功能。在动态添加Checkbox中我们定义了一个CheckBox数组，此后 ......

　　我们想要达到的结果是，绑定多个checkbox然后我们还可以获取它是否被选中，其实很简单，我们只要找到那几个关键的对象就可以了。

　　下面是ui,其中定义了一个wrappanel来存放checkbox，还有两个按钮，用于测试相关功能。

<window x:class="wpfapplication1.mainwindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:wpfapplication1"
        mc:ignorable="d"
        title="mainwindow" height="350" width="525">
    <grid  name="div" >
        <stackpanel margin="0,50,0,0" orientation="horizontal"  horizontalalignment="center">
            <stackpanel>
                <button content="动态添加多个checkbox控件" height="20" padding="15,1,15,2" x:name="btnadd" click="btnadd_click"></button>
            </stackpanel>

        </stackpanel>

        <scrollviewer scrollviewer.verticalscrollbarvisibility="auto" height="150">
            <border   borderbrush="#797979" borderthickness="1" margin="5,0,5,5">
                <wrappanel x:name="addcheckbox"/>
            </border>
        </scrollviewer>
        <button x:name="button" content="button" horizontalalignment="left" margin="37,261,0,0" verticalalignment="top" width="75" click="button_click"/>
        <button x:name="button1" content="button" horizontalalignment="left" margin="379,50,0,0" verticalalignment="top" width="75" click="button1_click"/>
    </grid>
</window>

　　在动态添加checkbox中我们定义了一个checkbox数组，此后又实例化了thickness对象，它是用于描述矩形周围的粗细，然后我们又循环了数组的长度来进行添加（对其中name为addcheckbox的控件），至此，checkbox已动态添加。

　　那如何删除呢？我们依旧需要获取那个名为addcheckbox的控件的儿子们（children）来进行remove。请看以下代码片段。

private void button1_click(object sender, routedeventargs e)
        {
            for (int i = 0; i < addcheckbox.children.count;)
            {
                this.addcheckbox.children.remove(addcheckbox.children[i]);
            }
        }

循环其中的值也是非常的简单，因为我们在上面绑定的时候，已经给它的content或者是datacontext都赋值了，所以我们只要获取就ok了。

private void button_click(object sender, routedeventargs e)
        {
            foreach (uielement item in addcheckbox.children)
            {
                if (item is checkbox)
                {
                    checkbox checkbox = (item as checkbox);
                    if (checkbox.ischecked == true)
                    {
                        messagebox.show(checkbox.content.tostring());
                    }
                }
            }
        }

最后生成出来的效果是这样的,是不是非常丑，那我教你如何进行简单的美化。

WPF 动态添加控件以及样式字典的引用(Style introduction)

在我们添加checkbox的时候有两种引入方式，一种是 checkbox.style = resources["noticebox"] as style; 另一种的话是 style style = (style)this.findresource("noticebutton"); 那两者有什么区别呢？

第一个是必须将资源文件引用到当前页面，第二种的是在app.xaml进行查找不包括app.xaml中引入的(外部的资源文件)。下面我们写一个checkbox样式在app,xaml中。

<application x:class="wpfapplication1.app"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:wpfapplication1"
             startupuri="mainwindow.xaml">

    <application.resources>
        <style x:key="checkboxswitchstyle" targettype="checkbox">
            <setter property="ischecked" value="false"/>
            <setter property="cursor" value="hand"/>
            <setter property="fontfamily" value="/mestoolintegration;component/fonts/#iconfont"/>
            <setter property="background" value="#ffffff"/>
            <setter property="template">
                <setter.value>
                    <controltemplate targettype="checkbox">
                        <border width="54" name="checktruebg" height="22" borderthickness="1" background="#ffffff"  cornerradius="10" borderbrush="#acacac" >
                            <grid>
                                <border borderthickness="1" background="#acacac" x:name="border" width="20" height="20" cornerradius="9" verticalalignment="center" horizontalalignment="left" margin="0"  >
                                    <border.rendertransform>
                                        <translatetransform  x="1"/>
                                    </border.rendertransform>
                                </border>
                                <textblock x:name="txt" text="{templatebinding content}" fontfamily="iconfont"  fontsize="{templatebinding fontsize}" margin="6.996,2.798,0,2.798" verticalalignment="stretch" foreground="#acacac" horizontalalignment="left" >
                                    <textblock.rendertransform>
                                        <translatetransform   x="17"></translatetransform>
                                    </textblock.rendertransform>
                                </textblock>
                            </grid>
                        </border>
                        <controltemplate.triggers>
                            <trigger property="ischecked" value="true">
                                <setter property="background" targetname="checktruebg"  value="#5fb878"/>
                                <setter property="foreground" targetname="txt"  value="#ffffff"/>
                                <setter property="background" targetname="border"  value="#ffffff"/>
                                <setter property="text" targetname="txt" value="{binding tag,relativesource={relativesource templatedparent}}"/>
                                <trigger.enteractions>
                                    <beginstoryboard>
                                        <storyboard>
                                            <doubleanimation storyboard.targetname="border" storyboard.targetproperty="(uielement.rendertransform).(translatetransform.x)" to="32" duration="00:00:0.2"/>
                                            <doubleanimation storyboard.targetname="txt" storyboard.targetproperty="(uielement.rendertransform).(translatetransform.x)" to="0" duration="00:00:0.2"/>
                                        </storyboard>
                                    </beginstoryboard>
                                </trigger.enteractions>
                                <trigger.exitactions>
                                    <beginstoryboard>
                                        <storyboard>
                                            <doubleanimation storyboard.targetname="border" storyboard.targetproperty="(uielement.rendertransform).(translatetransform.x)" to="0" duration="00:00:0.2"/>
                                            <doubleanimation storyboard.targetname="txt" storyboard.targetproperty="(uielement.rendertransform).(translatetransform.x)" to="17" duration="00:00:0.2"/>
                                        </storyboard>
                                    </beginstoryboard>
                                </trigger.exitactions>
                            </trigger>
                            <trigger property="ischecked" value="false">
                                <setter property="text" targetname="txt" value="{binding content,relativesource={relativesource templatedparent}}"/>
                            </trigger>
                        </controltemplate.triggers>
                    </controltemplate>
                </setter.value>
            </setter>
        </style>
    </application.resources>
</application>

就这样我们在生成checkbox中进行配置，代码如下。

private void btnadd_click(object sender, routedeventargs e)
        {
            int num = 6;
            checkbox[] check = new checkbox[num];
            thickness th = new thickness();
            th.bottom = 10;
            th.left = 10;
            th.right = 10;
            th.top = 10;
            for (int i = 0; i < check.length; i++)
            {
                check[i] = new checkbox();
                //设置checkbox属性
                check[i].margin = th;
                check[i].content = i + 1;
                check[i].name = "heheda";
                check[i].datacontext = "asdas";
                check[i].style = (style)this.findresource("checkboxswitchstyle");
          this.addcheckbox.children.add(check[i]);
            }
        }

启动页面我们可以发现引入成功了。

WPF 动态添加控件以及样式字典的引用(Style introduction)

不难发现，看一下代码，我们如何还想写别的样式，这个时候应该怎么办？难道还要往app.xaml里写？这就非常恶心了，所以我们采用引入的方式，这和css有点像！新建一个资源字典。

WPF 动态添加控件以及样式字典的引用(Style introduction)

在其中写入写入以下样式。

<resourcedictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:local="clr-namespace:wpfapplication1">
    <style x:key="btninfostyle" targettype="button">
        <setter property="width" value="70"/>
        <setter property="height" value="25"/>
        <setter property="foreground" value="white"/>
        <setter property="borderthickness" value="0"/>
        <setter property="background" value="#43a9c7"/>
        <setter property="template">
            <setter.value>
                <controltemplate targettype="button">
                    <border x:name="border" background="{templatebinding background}" borderbrush="{templatebinding borderbrush}" borderthickness="{templatebinding borderthickness}" snapstodevicepixels="true">
                        <textblock text="{templatebinding content}" foreground="{templatebinding foreground}" verticalalignment="center" horizontalalignment="center"/>
                    </border>
                    <controltemplate.triggers>
                        <trigger property="ismouseover" value="true">
                            <setter targetname="border" property="background" value="#2f96b4"/>
                        </trigger>
                        <trigger property="ispressed" value="true">
                            <setter targetname="border" property="background" value="#2a89a4"/>
                        </trigger>
                    </controltemplate.triggers>
                </controltemplate>
            </setter.value>
        </setter>
    </style>
</resourcedictionary>

然后在app.xaml中进行引用，这里需要注意是，有可能我们的style和外部字典都放进去了，它们的关系是style其实也是一个字典，然后就变成了这样。

<application.resources>
        <resourcedictionary>
            <resourcedictionary.mergeddictionaries>
                <resourcedictionary source="dictionary1.xaml"/>
            </resourcedictionary.mergeddictionaries>
            <style x:key="checkboxswitchstyle" targettype="checkbox">
                <setter property="ischecked" value="false"/>
                <setter property="cursor" value="hand"/>
                <setter property="fontfamily" value="/mestoolintegration;component/fonts/#iconfont"/>
                <setter property="background" value="#ffffff"/>
                <setter property="template">
                    <setter.value>
                        <controltemplate targettype="checkbox">
                            <border width="54" name="checktruebg" height="22" borderthickness="1" background="#ffffff"  cornerradius="10" borderbrush="#acacac" >
                                <grid>
                                    <border borderthickness="1" background="#acacac" x:name="border" width="20" height="20" cornerradius="9" verticalalignment="center" horizontalalignment="left" margin="0"  >
                                        <border.rendertransform>
                                            <translatetransform  x="1"/>
                                        </border.rendertransform>
                                    </border>
                                    <textblock x:name="txt" text="{templatebinding content}" fontfamily="iconfont"  fontsize="{templatebinding fontsize}" margin="6.996,2.798,0,2.798" verticalalignment="stretch" foreground="#acacac" horizontalalignment="left" >
                                        <textblock.rendertransform>
                                            <translatetransform   x="17"></translatetransform>
                                        </textblock.rendertransform>
                                    </textblock>
                                </grid>
                            </border>
                            <controltemplate.triggers>
                                <trigger property="ischecked" value="true">
                                    <setter property="background" targetname="checktruebg"  value="#5fb878"/>
                                    <setter property="foreground" targetname="txt"  value="#ffffff"/>
                                    <setter property="background" targetname="border"  value="#ffffff"/>
                                    <setter property="text" targetname="txt" value="{binding tag,relativesource={relativesource templatedparent}}"/>
                                    <trigger.enteractions>
                                        <beginstoryboard>
                                            <storyboard>
                                                <doubleanimation storyboard.targetname="border" storyboard.targetproperty="(uielement.rendertransform).(translatetransform.x)" to="32" duration="00:00:0.2"/>
                                                <doubleanimation storyboard.targetname="txt" storyboard.targetproperty="(uielement.rendertransform).(translatetransform.x)" to="0" duration="00:00:0.2"/>
                                            </storyboard>
                                        </beginstoryboard>
                                    </trigger.enteractions>
                                    <trigger.exitactions>
                                        <beginstoryboard>
                                            <storyboard>
                                                <doubleanimation storyboard.targetname="border" storyboard.targetproperty="(uielement.rendertransform).(translatetransform.x)" to="0" duration="00:00:0.2"/>
                                                <doubleanimation storyboard.targetname="txt" storyboard.targetproperty="(uielement.rendertransform).(translatetransform.x)" to="17" duration="00:00:0.2"/>
                                            </storyboard>
                                        </beginstoryboard>
                                    </trigger.exitactions>
                                </trigger>
                                <trigger property="ischecked" value="false">
                                    <setter property="text" targetname="txt" value="{binding content,relativesource={relativesource templatedparent}}"/>
                                </trigger>
                            </controltemplate.triggers>
                        </controltemplate>
                    </setter.value>
                </setter>
            </style>
        </resourcedictionary>
    </application.resources>

我把缩进的截图发上来，更直观。

WPF 动态添加控件以及样式字典的引用(Style introduction)

在其中还有内嵌的样式，可以这么写，如果是page的话你就 <page.resources> ，如果是windows的话那就wndows，当然如果需要页面引入字典的话你可以这么做。

<window.resources>
        <resourcedictionary>
            <resourcedictionary.mergeddictionaries>
                <resourcedictionary source="style/test.xaml"/>
            </resourcedictionary.mergeddictionaries>
        </resourcedictionary>
    </window.resources>

那么今天就这样~

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