基于WPF实现拟物音量控件
更新时间:2023年05月10日 09:40:14 作者:WPF开发者
这篇文章主要为大家详细介绍了如何基于WPF实现简单的拟物音量控件,文中的示例代码讲解详细,对我们学习或工作有一定帮助,感兴趣的小伙伴可以了解一下
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WPF 实现拟物音量控件
控件名:Wheel
作者:WPFDevelopersOrg - 俞宏伟
原文链接:https://github.com/WPFDevelopersOrg/SimulationControl
- 框架使用
.NET6
; Visual Studio 2022
;- 绘制使用了
Canvas
作为容器控件,DrawingContext
上绘制水平线。 - 当鼠标滚动滚轮时或按下鼠标向上向下拖动时计算角度偏移并更新图层。
实现代码
1)创建 Wheel.xaml
代码如下:
<UserControl?x:Class="TopControl.Wheel" ?????????????xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" ?????????????xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" ?????????????xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"? ?????????????xmlns:d="http://schemas.microsoft.com/expression/blend/2008"? ?????????????xmlns:local="clr-namespace:TopControl" ?????????????mc:Ignorable="d"? ?????????????Width="30"?Height="180"> ????<Grid> ????????<!--?进度?--> ????????<Grid?Width="2"?Background="#0a0a0a"?Height="180"?HorizontalAlignment="Left"?VerticalAlignment="Bottom"/> ????????<Grid?Width="2"?x:Name="Grid_Value"?Height="0"?HorizontalAlignment="Left"?VerticalAlignment="Bottom"> ????????????<Grid?Height="180"?VerticalAlignment="Bottom"> ????????????????<Grid.Background> ????????????????????<LinearGradientBrush?StartPoint="0,0"?EndPoint="0,1"> ????????????????????????<GradientStop?Offset="0"?Color="#f0d967"/> ????????????????????????<GradientStop?Offset="1"?Color="#33b08d"/> ????????????????????</LinearGradientBrush> ????????????????</Grid.Background> ????????????</Grid> ????????</Grid> ????????<Grid?Background="#0a0a0a"?Width="26"?HorizontalAlignment="Right"?Height="180"?Margin="2,0,0,0"/> ????????<!--?滚轮?--> ????????<Grid?x:Name="WheelArea"?Height="176"?Width="22"?HorizontalAlignment="Right"?Margin="0,0,2,0" ??????????????MouseDown="WheelArea_MouseDown"?MouseMove="WheelArea_MouseMove"?MouseUp="WheelArea_MouseUp"?MouseWheel="WheelArea_MouseWheel"> ????????????<Grid.Background> ????????????????<LinearGradientBrush?StartPoint="0,0"?EndPoint="0,1"> ????????????????????<GradientStop?Color="#141414"?Offset="0"/> ????????????????????<GradientStop?Color="#3c3c3c"?Offset="0.5"/> ????????????????????<GradientStop?Color="#141414"?Offset="1"/> ????????????????</LinearGradientBrush> ????????????</Grid.Background> ????????????<Grid?x:Name="LayerBox"?IsHitTestVisible="False"/> ????????</Grid> ????</Grid> </UserControl>
2)创建 Wheel.xaml.cs
代码如下:
using?System.Windows; using?System.Windows.Controls; using?System.Windows.Input; namespace?TopControl { ????public?partial?class?Wheel?:?UserControl ????{ ????????public?Wheel() ????????{ ????????????InitializeComponent(); ????????????Loaded?+=?Wheel_Loaded; ????????} ????????#region?属性 ????????public?int?MinValue?{?get;?set;?}?=?-720; ????????public?int?MaxValue?{?get;?set;?}?=?720; ????????public?int?Value?{?get;?set;?}?=?-720; ????????#endregion ????????#region?控件事件 ????????private?void?Wheel_Loaded(object?sender,?RoutedEventArgs?e) ????????{ ????????????InitLayer(); ????????} ????????private?void?WheelArea_MouseDown(object?sender,?MouseButtonEventArgs?e) ????????{ ????????????if?(e.ChangedButton?==?MouseButton.Left) ????????????{ ????????????????BeginDrag(); ????????????} ????????} ????????private?void?WheelArea_MouseMove(object?sender,?MouseEventArgs?e) ????????{ ????????????if?(_dragMode) ????????????{ ????????????????Drag(); ????????????} ????????} ????????private?void?WheelArea_MouseUp(object?sender,?MouseButtonEventArgs?e) ????????{ ????????????if?(e.ChangedButton?==?MouseButton.Left?&&?_dragMode) ????????????{ ????????????????EndDrag(); ????????????} ????????} ????????private?void?WheelArea_MouseWheel(object?sender,?MouseWheelEventArgs?e) ????????{ ????????????if?(_dragMode)?return; ????????????int?offset?=?e.Delta?/?120; ????????????if?(offset?<?0?&&?Value?>?MinValue) ????????????{ ????????????????Value?+=?offset; ????????????????UpdateProgress(); ????????????????_wheelLayer.AngleOffset?-=?offset?*?_wheelSpeed; ????????????????_wheelLayer.UpdateLayer(); ????????????} ????????????else?if?(offset?>?0?&&?Value?<?MaxValue) ????????????{ ????????????????Value?+=?offset; ????????????????UpdateProgress(); ????????????????_wheelLayer.AngleOffset?-=?offset?*?_wheelSpeed; ????????????????_wheelLayer.UpdateLayer(); ????????????} ????????} ????????#endregion ????????#region?鼠标操作 ????????private?void?BeginDrag() ????????{ ????????????_dragMode?=?true; ????????????WheelArea.CaptureMouse(); ????????????_dragStart?=?Mouse.GetPosition(WheelArea); ????????????_angleStart?=?_wheelLayer.AngleOffset; ????????????_valueStart?=?Value; ????????????_offsetDown?=?Value?-?MinValue; ????????????_offsetUp?=?Value?-?MaxValue; ????????} ????????private?void?Drag() ????????{ ????????????double?offset_y?=?Mouse.GetPosition(WheelArea).Y?-?_dragStart.Y; ????????????if?(offset_y?<?_offsetUp)?offset_y?=?_offsetUp; ????????????else?if?(offset_y?>?_offsetDown)?offset_y?=?_offsetDown; ????????????double?offset_angle?=?offset_y?*?_wheelSpeed; ????????????Value?=?_valueStart?-?(int)offset_y; ????????????_wheelLayer.AngleOffset?=?_angleStart?+?offset_angle; ????????????UpdateProgress(); ????????????_wheelLayer.UpdateLayer(); ????????} ????????private?void?EndDrag() ????????{ ????????????_dragMode?=?false; ????????????WheelArea.ReleaseMouseCapture(); ????????} ????????#endregion ????????#region?私有方法 ????????///?<summary> ????????///?初始化图层 ????????///?</summary> ????????private?void?InitLayer() ????????{ ????????????_wheelLayer.Width?=?LayerBox.ActualWidth; ????????????_wheelLayer.Height?=?LayerBox.ActualHeight; ????????????LayerBox.Children.Add(_wheelLayer); ????????????_wheelLayer.Init(); ????????????_wheelLayer.UpdateLayer(); ????????} ????????///?<summary> ????????///?更新进度 ????????///?</summary> ????????private?void?UpdateProgress() ????????{ ????????????Grid_Value.Height?=?(double)(Value?-?MinValue)?/?(MaxValue?-?MinValue)?*?180; ????????} ????????#endregion ????????#region?字段 ????????private?readonly?WheelLayer?_wheelLayer?=?new?WheelLayer(); ????????private?Point?_dragStart?=?new?Point(); ????????private?double?_angleStart?=?0; ????????private?int?_valueStart?=?0; ????????private?bool?_dragMode?=?false; ????????///?<summary>滚轮速度</summary> ????????private?readonly?double?_wheelSpeed?=?0.7; ????????///?<summary>最大向上偏移</summary> ????????private?double?_offsetUp; ????????///?<summary>最大向下偏移</summary> ????????private?double?_offsetDown; ????????#endregion ????} }
3)创建 WheelLayer.cs
代码如下:
using?MathUtil; using?System; using?System.Collections.Generic; using?System.Runtime.CompilerServices; using?System.Windows; using?System.Windows.Media; using?WpfUtil; namespace?TopControl { ????public?class?WheelLayer?:?SingleLayer ????{ ????????#region?属性 ????????///?<summary>槽高度:180px -?上下边框(4px)</summary> ????????public?int?GrooveHeight?{?get;?set;?}?=?176; ????????///?<summary>角度:圆弧切线与槽边的夹角</summary> ????????public?int?Angle?{?get;?set;?}?=?90; ????????///?<summary>刻度线数量</summary> ????????public?int?LineCount?{?get;?set;?}?=?90; ????????///?<summary>角度偏移</summary> ????????public?double?AngleOffset?{?get;?set;?}?=?0; ????????#endregion ????????#region?公开方法 ????????public?override?void?Init() ????????{ ????????????//?起点、终点、中点 ????????????Point2D?startPoint?=?new?Point2D(0,?0); ????????????Point2D?endPoint?=?new?Point2D(GrooveHeight,?0); ????????????Point2D?centerPoint?=?startPoint.CenterWith(endPoint); ????????????//?向量:中点?->?起点 ????????????Vector2?centerToStart?=?new?Vector2(centerPoint,?startPoint); ????????????centerToStart.Rotate(-90); ????????????//?向量:终点?->?中点 ????????????Vector2?endToCenter?=?new?Vector2(endPoint,?centerPoint); ????????????endToCenter.Rotate(-90?+?Angle); ????????????//?圆心 ????????????_circleCenter?=?centerToStart.IntersectionWith(endToCenter); ????????????//?向量:圆心?->?起点 ????????????Vector2?vector?=?new?Vector2(_circleCenter,?startPoint); ????????????_radius?=?vector.Distance; ????????????_anglePerLine?=?360.0?/?LineCount; ????????} ????????protected?override?void?OnUpdate() ????????{ ????????????//?最高点 ????????????Point2D?top?=?new?Point2D(_circleCenter.X,?_circleCenter.Y?-?_radius); ????????????//?向量:圆心?->?最高点 ????????????Vector2?vector?=?new?Vector2(_circleCenter,?top); ????????????double?max?=?Math.Abs(vector.Target.Y); ????????????//?偏移角度 ????????????vector.Rotate(AngleOffset); ????????????//?开始旋转计算刻度位置 ????????????List<Point2D>?pointList?=?new?List<Point2D>(); ????????????for?(int?counter?=?0;?counter?<?LineCount;?counter++) ????????????{ ????????????????if?(vector.Target.Y?<?0)?pointList.Add(vector.Target); ????????????????vector.Rotate(-_anglePerLine); ????????????} ????????????//?绘制刻度线 ????????????foreach?(var?item?in?pointList) ????????????????DrawHorizontalLine(item.X,?Math.Abs(item.Y)?/?max); ????????} ????????#endregion ????????#region?私有方法 ????????///?<summary> ????????///?绘制水平线 ????????///?</summary> ????????[MethodImpl(MethodImplOptions.AggressiveInlining)] ????????private?void?DrawHorizontalLine(double?y,?double?opacity) ????????{ ????????????Pen?pen?=?new?Pen(new?SolidColorBrush(Color.FromArgb((byte)(opacity?*?255),?32,?32,?32)),?1); ????????????Pen?pen2?=?new?Pen(new?SolidColorBrush(Color.FromArgb((byte)(opacity?*?255),?64,?64,?64)),?1); ????????????_dc.DrawLine(pen,?new?Point(2,?y?-?0.5),?new?Point(Width?-?2,?y?-?0.5)); ????????????_dc.DrawLine(pen2,?new?Point(2,?y?+?0.5),?new?Point(Width?-?2,?y?+?0.5)); ????????} ????????#endregion ????????#region?字段 ????????///?<summary>圆心</summary> ????????private?Point2D?_circleCenter?=?new?Point2D(0,?0); ????????///?<summary>半径</summary> ????????private?double?_radius?=?0; ????????///?<summary>刻度线之间的夹角</summary> ????????private?double?_anglePerLine?=?0; ????????#endregion ????} }
4)创建 WheelExample.xaml
代码如下:
<wd:Window?x:Class="TopControl.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:TopControl" ????????xmlns:wd="https://github.com/WPFDevelopersOrg/WPFDevelopers" ????????mc:Ignorable="d"?Background="#1e1e1e" ????????Title="https://github.com/WPFDevelopersOrg/SimulationControl?-?俞宏伟"?Height="450"?Width="800"> ????<Grid> ????????<local:Wheel?HorizontalAlignment="Left"?VerticalAlignment="Top"?Margin="50"/> ????</Grid> </wd:Window>
效果图
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