WPF中进度条同步实现

WPF界面的编写

滑动条的显示

//前台界面的设计

与滑动条同步的画笔大小

相关属性的使用

画笔大小的设置

//画笔默认是初始值是15
private double penWidth = 15;
        public double PenWidth {
            get {
                return penWidth;
            }
            set {
                Set(ref penWidth, value);
                OnDragDelta?.Invoke();
            }
        }

?. ：是在C#6.0中才有的，这个也称为空值传播运算，这个运算可以确保在事件没有订阅是不引发事件的
OnDragDelta?.Invoke();中的OnDragDelta，是在最开始进行封装了"public event Action OnDragDelta;"
画笔最大值属性的设置

 private int maxPenWidth;
        public int MaxPenWidth {
            get {
                return maxPenWidth;
            }
            set {
                Set(ref maxPenWidth, value);
                PenWidth = value * 0.2;
            }
        }

Scale属性可以通过鼠标，加与减相关命令来控制画笔大小

private double scale = 1.0;
        public double Scale {
            get {
                return scale;
            }
            set {
                Set(ref scale, value);
            }
        }

相关控制的命令

private RelayCommand reduceVisualCommand = null;
        public RelayCommand ReduceVisualCommand {
            get {
                return reduceVisualCommand ?? new RelayCommand(() => {
                    double targetScale = Math.Round(Scale - 0.1, 1);
                    if (targetScale < 0.4) {
                        targetScale = 0.4;
                    }
                    Scale = targetScale;
                });
            }
        }

        private RelayCommand mouseWheelCommand = null;
        public RelayCommand MouseWheelCommand {
            get {
                return mouseWheelCommand ?? new RelayCommand((delta) => {
                    double targetScale = Scale + delta * 0.001;
                    if (targetScale > 10.0) {
                        targetScale = 10.0;
                    }
                    if (targetScale < 0.4) {
                        targetScale = 0.4;
                    }
                    Scale = targetScale;
                });
            }
        }

        private RelayCommand addVisualCommand = null;
        public RelayCommand AddVisualCommand {
            get {
                return addVisualCommand ?? new RelayCommand(() => {
                    double targetScale = Math.Round(Scale + 0.1, 1);
                    if (targetScale > 10.0) {
                        targetScale = 10.0;
                    }
                    Scale = targetScale;
                });
            }
        }

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WPF中进度条同步实现

WPF界面的编写

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