下面代码中从右到左的布局属性

Question

我正在为 Windows CE .Net 2.0 C# 应用程序创建自己的自定义进度条控件。下面是运行良好的代码，唯一缺少的是我想从右到左显示进度任何人都可以帮助我修改此代码以获取 RTL 属性

Code Refering

using System;
using System.Drawing;
using System.Windows.Forms;
class CustomProgressBar:UserControl
{
    int min = 0;    // Minimum value for progress range
    int max = 100;  // Maximum value for progress range
    int val = 0;        // Current progress
    Color BarColor = Color.Blue;        // Color of progress meter
    protected override void OnResize(EventArgs e)
    {
        // Invalidate the control to get a repaint.
        this.Invalidate();
    }
    protected override void OnPaint(PaintEventArgs e)
    {
        Graphics g = e.Graphics;
        SolidBrush brush = new SolidBrush(BarColor);
        float percent = (float)(val - min) / (float)(max - min);
        Rectangle rect = this.ClientRectangle;

        // Calculate area for drawing the progress.
        rect.Width = (int)((float)rect.Width * percent);

        // Draw the progress meter.
        g.FillRectangle(brush, rect);

        // Draw a three-dimensional border around the control.
        Draw3DBorder(g);

        // Clean up.
        brush.Dispose();
        g.Dispose();
    }

    public int Minimum
    {
        get
        {
            return min;
        }

        set
        {
            // Prevent a negative value.
            if (value < 0)
            {
                min = 0;
            }

            // Make sure that the minimum value is never set higher than the maximum value.
            if (value > max)
            {
                min = value;
                min = value;
            }

            // Ensure value is still in range
            if (val < min)
            {
                val = min;
            }

            // Invalidate the control to get a repaint.
            this.Invalidate();
        }
    }

    public int Maximum
    {
        get
        {
            return max;
        }

        set
        {
            // Make sure that the maximum value is never set lower than the minimum value.
            if (value < min)
            {
                min = value;
            }

            max = value;

            // Make sure that value is still in range.
            if (val > max)
            {
                val = max;
            }

            // Invalidate the control to get a repaint.
            this.Invalidate();
        }
    }

    public int Value
    {
        get
        {
            return val;
        }

        set
        {
            int oldValue = val;

            // Make sure that the value does not stray outside the valid range.
            if (value < min)
            {
                val = min;
            }
            else if (value > max)
            {
                val = max;
            }
            else
            {
                val = value;
            }

            // Invalidate only the changed area.
            float percent;

            Rectangle newValueRect = this.ClientRectangle;
            Rectangle oldValueRect = this.ClientRectangle;

            // Use a new value to calculate the rectangle for progress.
            percent = (float)(val - min) / (float)(max - min);
            newValueRect.Width = (int)((float)newValueRect.Width * percent);

            // Use an old value to calculate the rectangle for progress.
            percent = (float)(oldValue - min) / (float)(max - min);
            oldValueRect.Width = (int)((float)oldValueRect.Width * percent);

            Rectangle updateRect = new Rectangle();

            // Find only the part of the screen that must be updated.
            if (newValueRect.Width > oldValueRect.Width)
            {
                updateRect.X = oldValueRect.Size.Width;
                updateRect.Width = newValueRect.Width - oldValueRect.Width;
            }
            else
            {
                updateRect.X = newValueRect.Size.Width;
                updateRect.Width = oldValueRect.Width - newValueRect.Width;
            }

            updateRect.Height = this.Height;

            // Invalidate the intersection region only.
            this.Invalidate(updateRect);
        }
    }

    public Color ProgressBarColor
    {
        get
        {
            return BarColor;
        }

        set
        {
            BarColor = value;

            // Invalidate the control to get a repaint.
            this.Invalidate();
        }
    }

    private void Draw3DBorder(Graphics g)
    {
        int PenWidth = (int)Pens.White.Width;

        g.DrawLine(Pens.DarkGray,
            new Point(this.ClientRectangle.Left, this.ClientRectangle.Top),
            new Point(this.ClientRectangle.Width - PenWidth, this.ClientRectangle.Top));
        g.DrawLine(Pens.DarkGray,
            new Point(this.ClientRectangle.Left, this.ClientRectangle.Top),
            new Point(this.ClientRectangle.Left, this.ClientRectangle.Height - PenWidth));
        g.DrawLine(Pens.White,
            new Point(this.ClientRectangle.Left, this.ClientRectangle.Height - PenWidth),
            new Point(this.ClientRectangle.Width - PenWidth, this.ClientRectangle.Height - PenWidth));
        g.DrawLine(Pens.White,
            new Point(this.ClientRectangle.Width - PenWidth, this.ClientRectangle.Top),
            new Point(this.ClientRectangle.Width - PenWidth, this.ClientRectangle.Height - PenWidth));
    }
}

Answer 1

在上面的代码中，进度矩形是这样创建的：

float percent = (float)(val - min) / (float)(max - min);
Rectangle rect = this.ClientRectangle;
rect.Width = (int)((float)rect.Width * percent);

您可以简单地将代码更改为以下代码，以从控件右侧填充进度矩形：

float percent = (float)(val - min) / (float)(max - min);
Rectangle rect = this.ClientRectangle;
var w = (int)((float)rect.Width * percent);
rect.X = rect.Width - w;
rect.Width = w;