Question

在listBox的左侧我有一些项目。我想这样做，当我点击一个项目绘制矩形点击按钮ConfirmRectangle它会记住，在这个项目中我绘制了一个矩形。因此，如果我移动到一个我没有绘制矩形的项目，它将显示该项目，因为它没有任何绘制的矩形。但是，如果我在显示我绘制的矩形之前单击任何已经绘制矩形的项目，并且还启用了False按钮ConfirmRectangle。未启用矩形的项目为true，启用了绘制矩形的按钮项目为false。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;

namespace MinimizeCapture
{
    public partial class Form1 : Form
    {
        Rectangle RectClone;
        bool btn = false;
        Point RectStartPoint = Point.Empty;
        Point RectEndPoint = Point.Empty;
        private Brush selectionBrush = new SolidBrush(Color.Red);
        private Pen pen;
        private string selectedIndex;

        public Form1()
        {
            InitializeComponent();

            this.DoubleBuffered = true;
            btn = false;
            pen = new Pen(selectionBrush);
        }

        private void buttonSnap_Click(object sender, EventArgs e)
        {
            this.listBoxSnap.Items.Clear();
            this.pictureBoxSnap.Image = null;
            backgroundWorker1.RunWorkerAsync();
        }

        private void listBoxSnap_SelectedIndexChanged(object sender, EventArgs e)
        {
            WindowSnap snap = this.listBoxSnap.SelectedItem as WindowSnap;
            selectedIndex = this.listBoxSnap.SelectedIndex.ToString();
            this.pictureBoxSnap.Image = snap.Image;
        }

        private void checkBoxForceMDI_CheckedChanged(object sender, EventArgs e)
        {
            WindowSnap.ForceMDICapturing = (sender as CheckBox).Checked;
        }

        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            listBoxSnap.Invoke(new MethodInvoker(delegate { this.listBoxSnap.Items.AddRange(WindowSnap.GetAllWindows(true, true).ToArray()); }));
        }

        private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {

        }

        private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {

        }

        private void pictureBoxSnap_Paint(object sender, PaintEventArgs e)
        {
            if (pictureBoxSnap.Image != null)
            {
                {
                    Rectangle Rect = getRect(RectStartPoint, RectEndPoint);
                    RectClone = Rect;
                    if (Rect != Rectangle.Empty)
                    {
                        e.Graphics.DrawRectangle(Pens.Firebrick, Rect);
                    }
                }
            }
        }

        private void pictureBoxSnap_MouseMove(object sender, MouseEventArgs e)
        {
            if (btn == true)
            {
                RectEndPoint = e.Location;
                pictureBoxSnap.Invalidate();
            }
        }

        private void pictureBoxSnap_MouseDown(object sender, MouseEventArgs e)
        {
            RectStartPoint = e.Location;
            btn = true;
        }

        private void pictureBoxSnap_MouseUp(object sender, MouseEventArgs e)
        {
            btn = false;
            RectEndPoint = e.Location;
            pictureBoxSnap.Invalidate();
        }

        Rectangle getRect(Point p1, Point p2)
        {
            Point p = new Point(Math.Min(p1.X, p2.X), Math.Min(p1.Y, p2.Y));
            Size s = new Size(Math.Abs(p1.X - p2.X), Math.Abs(p1.Y - p2.Y));
            return new Rectangle(p, s);
        }

        private void ConfirmRectangle_Click(object sender, EventArgs e)
        {
            ConfirmRectangle.ForeColor = Color.Red;
            ConfirmRectangle.Enabled = false;
            StreamWriter w = new StreamWriter(@"c:\temp\Settings.txt", true);
            w.WriteLine("Rectangle Location: " + RectClone.Location + " Rectangle Size: " + RectClone.Size + " Selected Index: " + selectedIndex);
            textBoxIndex.Text = selectedIndex.ToString();
            w.Close();
            listBoxSnap.Invalidate();
        }
    }
}

Answer 1

以下是一个可用于填充ListBox的课程，而不是原来的WindowSnap课程：

class SnapWrapper
{
    public WindowSnap windowSnap { get; set; }
    public Rectangle rect { get; set; }
    public Bitmap bitmap { get; set; }
    public SnapWrapper(WindowSnap windowSnap_) { windowSnap = windowSnap_; }
    public override string ToString() {  return windowSnap.ToString();  }
    public bool IsSet() { return rect != Rectangle.Empty; }
}

您可以使用WindowSnap ..

替换大多数SnapWrapper.windowSnap引用

现在您可以在SelectedItem中设置矩形，也可以在OKButton_Click事件中设置：

if (listBox1.SelectedItem != null)
   (listBox1.SelectedItem as SnapWrapper).rect = getRect(RectStartPoint, RectEndPoint);

使用上一个问题中的getRect函数;或者再次删除它：

if (listBox1.SelectedItem != null)
    (listBox1.SelectedItem as SnapWrapper).rect = Rectangle.Empty;

并检查：

if (listBox1.SelectedItem != null)
   if ((listBox1.SelectedItem as SnapWrapper).IsSet() ) //do stuff...

如何从图像中复制部分很容易用谷歌搜索; Graphics.DrawImage(image, destRect, srceRect, unit)格式将完成这项工作..

如何根据listBox中选定的索引将绘制的矩形保留在pictureBox上？

1 个答案: