分享在winform下实现左右布局多窗口界面-续篇

之前的这篇文章《分享在winform下实现左右布局多窗口界面》已经实现了左右布局多窗口界面，今天本来是研究基于winform的插件编程，没想到顺便又找到了另一种实现方案，这种实现方案更简单，要写的代码也很少，具体实现如下。

可视化设计部份：

1.父窗口：ParentForm的IsMdiContainer 设置为 true，即：this.IsMdiContainer=true;

2.在父窗口中添加一个顶部菜单：menuStrip1，并新增一个菜单项：Windows，且将menuStrip1的MdiWindowListItem设置为该Windows菜单对象，即： this.menuStrip1.MdiWindowListItem = this.windowsToolStripMenuItem;

3.在父窗口中添加一个树形菜单：treeView1，并将其Dock设为左靠齐，即：this.treeView1.Dock = System.Windows.Forms.DockStyle.Left;且将margin设为0；

4.在父窗口中添加一个Panel:panel1,且将其width设为3；

以下是设计后自动生成的代码：

namespace WinFormTest
{
    partial class ParentForm
    {
        /// <summary>
        /// 必需的设计器变量。
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// 清理所有正在使用的资源。
        /// </summary>
        /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows 窗体设计器生成的代码

        /// <summary>
        /// 设计器支持所需的方法 - 不要
        /// 使用代码编辑器修改此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {
            this.menuStrip1 = new System.Windows.Forms.MenuStrip();
            this.windowsToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
            this.treeView1 = new System.Windows.Forms.TreeView();
            this.panel1 = new System.Windows.Forms.Panel();
            this.menuStrip1.SuspendLayout();
            this.SuspendLayout();
            //
            // menuStrip1
            //
            this.menuStrip1.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {
            this.windowsToolStripMenuItem});
            this.menuStrip1.Location = new System.Drawing.Point(0, 0);
            this.menuStrip1.MdiWindowListItem = this.windowsToolStripMenuItem;
            this.menuStrip1.Name = "menuStrip1";
            this.menuStrip1.Size = new System.Drawing.Size(684, 25);
            this.menuStrip1.TabIndex = 0;
            this.menuStrip1.Text = "menuStrip1";
            //
            // windowsToolStripMenuItem
            //
            this.windowsToolStripMenuItem.Name = "windowsToolStripMenuItem";
            this.windowsToolStripMenuItem.Size = new System.Drawing.Size(73, 21);
            this.windowsToolStripMenuItem.Text = "Windows";
            //
            // treeView1
            //
            this.treeView1.Dock = System.Windows.Forms.DockStyle.Left;
            this.treeView1.Location = new System.Drawing.Point(0, 25);
            this.treeView1.Margin = new System.Windows.Forms.Padding(0);
            this.treeView1.Name = "treeView1";
            this.treeView1.Size = new System.Drawing.Size(228, 380);
            this.treeView1.TabIndex = 3;
            this.treeView1.NodeMouseDoubleClick += new System.Windows.Forms.TreeNodeMouseClickEventHandler(this.treeView1_NodeMouseDoubleClick);

            //
            // panel1
            //
            this.panel1.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
            | System.Windows.Forms.AnchorStyles.Left)));
            this.panel1.BackColor = System.Drawing.Color.Red;
            this.panel1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
            this.panel1.Cursor = System.Windows.Forms.Cursors.VSplit;
            this.panel1.Location = new System.Drawing.Point(230, 28);
            this.panel1.Margin = new System.Windows.Forms.Padding(0);
            this.panel1.Name = "panel1";
            this.panel1.Size = new System.Drawing.Size(3, 100);
            this.panel1.TabIndex = 5;

            //
            // Form1
            //
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(684, 405);
            this.Controls.Add(this.panel1);
            this.Controls.Add(this.treeView1);
            this.Controls.Add(this.menuStrip1);
            this.IsMdiContainer = true;
            this.MainMenuStrip = this.menuStrip1;
            this.Name = "Form1";
            this.Text = "Form1";
            this.Load += new System.EventHandler(this.Form1_Load);
            this.Resize += new System.EventHandler(this.Form1_Resize);
            this.menuStrip1.ResumeLayout(false);
            this.menuStrip1.PerformLayout();
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        #endregion

        private System.Windows.Forms.MenuStrip menuStrip1;
        private System.Windows.Forms.ToolStripMenuItem windowsToolStripMenuItem;
        private System.Windows.Forms.TreeView treeView1;
        private System.Windows.Forms.Panel panel1;
    }
}

编码部份：

其实上面的设计后，如果通过以下定义的方法打开一个子窗口，则直接实现了左右布局且包含多子窗口的界面。

        private void ShowChildForm<TForm>() where TForm : Form, new()
        {
            Form childForm = new TForm();
            childForm.MdiParent = this;
            childForm.Name = "ChildForm - " + DateTime.Now.Millisecond.ToString();
            childForm.Text = childForm.Name;
            childForm.Show();
        }

当然仍然有不完美的地方，那就是左边菜单栏宽度不能动态调整，而又没有用到splitContainer，故我们只有自己来实现，其实也很简单，步骤如下：　

1.在父窗口构造函数中加入初始化panel1（用作分割器）位置及订阅相关事件，代码如下：

        public ParentForm()
        {
            InitializeComponent();

            panel1.MouseDown += panel1_MouseDown;
            panel1.MouseUp += panel1_MouseUp;
            panel1.MouseMove += panel1_MouseMove;

            panel1.Top = menuStrip1.Height;
            panel1.Left = treeView1.Left + treeView1.Width;
            panel1.Height = panel1.Parent.Height;
        }

上述代码的作用是：1.保证panel1的高度与位置与左侧树形菜单控件相匹配；2.订阅的三个Mouse事件主要是为了后面实现移动panel1。

2.实现订阅的三个Mouse事件所对应的方法，分别为鼠标按下、鼠标移动、鼠标松开，代码如下：

private bool startMove = false; //用于标记是否在移动中

        void panel1_MouseMove(object sender, MouseEventArgs e)
        {
            if (startMove)
            {
                panel1.Left += e.X;
            }
        }

        void panel1_MouseUp(object sender, MouseEventArgs e)
        {
            if (startMove)
            {
                panel1.Left += e.X;
                startMove = false;
                this.treeView1.Width = panel1.Left;
            }
        }

        void panel1_MouseDown(object sender, MouseEventArgs e)
        {
            startMove = true;
        }

上述代码作用：按下鼠标标记为开始移动，然后移动鼠标，若是标记移动中，说明是要移动panel1，故直接将鼠标当前的X坐标位置累加到panel1.Left属性上，从而实现移动，当鼠标弹起后，则将树形菜单的宽度设置为panel1.Left，从而实现树形菜单随panel1的移动而改变大小。

同时为了保证panel1的高度始终与树形菜单相同，在父窗口的Resize方法加入动态调整panel1的高度，代码如下：

        private void ParentForm_Resize(object sender, EventArgs e)
        {
            panel1.Height = panel1.Parent.Height;
        }

到此就完成了整个的实现方案，为了便于模拟在树形菜单中双击打开子窗口的效果，同时也添加了如下代码：

        private void ParentForm_Load(object sender, EventArgs e)
        {
            LoadMenuNodes();
        }

        private void LoadMenuNodes() //实现情况应该是从数据库及用户权限来进行动态创建菜单项
        {
            this.treeView1.Nodes.Clear();
            var root = this.treeView1.Nodes.Add("Root");
            for (int i = 1; i <= 10; i++)
            {
                var section = root.Nodes.Add("Section-" + i);
                int maxNodes = new Random(i).Next(1, 10);
                for (int n = 1; n <= maxNodes; n++)
                {
                    section.Nodes.Add(string.Format("Level-{0}-{1}", i, n));
                }
            }
        }

        private void treeView1_NodeMouseDoubleClick(object sender, TreeNodeMouseClickEventArgs e)
        {
            if (e.Node.Nodes.Count <= 0)//当非父节点（即：实际的功能节点）
            {
                ShowChildForm<ChildForm>();
            }
        }

附上完整的实现代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WinFormTest
{
    public partial class ParentForm : Form
    {
        private bool startMove = false;

        public ParentForm()
        {
            InitializeComponent();

            panel1.MouseDown += panel1_MouseDown;
            panel1.MouseUp += panel1_MouseUp;
            panel1.MouseMove += panel1_MouseMove;

            panel1.Top = menuStrip1.Height;
            panel1.Left = treeView1.Left + treeView1.Width;
            panel1.Height = panel1.Parent.Height;
        }

        void panel1_MouseMove(object sender, MouseEventArgs e)
        {
            if (startMove)
            {
                panel1.Left += e.X;
            }
        }

        void panel1_MouseUp(object sender, MouseEventArgs e)
        {
            if (startMove)
            {
                panel1.Left += e.X;
                startMove = false;
                this.treeView1.Width = panel1.Left;
            }
        }

        void panel1_MouseDown(object sender, MouseEventArgs e)
        {
            startMove = true;
        }

        private void ParentForm_Load(object sender, EventArgs e)
        {
            LoadMenuNodes();
        }

        private void treeView1_NodeMouseDoubleClick(object sender, TreeNodeMouseClickEventArgs e)
        {
            if (e.Node.Nodes.Count <= 0)//当非父节点（即：实际的功能节点）
            {
                ShowChildForm<ChildForm>();
            }
        }

        private void ParentForm_Resize(object sender, EventArgs e)
        {
            panel1.Height = panel1.Parent.Height;
        }

        private void LoadMenuNodes() //实现情况应该是从数据库及用户权限来进行动态创建菜单项
        {
            this.treeView1.Nodes.Clear();
            var root = this.treeView1.Nodes.Add("Root");
            for (int i = 1; i <= 10; i++)
            {
                var section = root.Nodes.Add("Section-" + i);
                int maxNodes = new Random(i).Next(1, 10);
                for (int n = 1; n <= maxNodes; n++)
                {
                    section.Nodes.Add(string.Format("Level-{0}-{1}", i, n));
                }
            }
        }

        private void ShowChildForm<TForm>() where TForm : Form, new()
        {
            Form childForm = new TForm();
            childForm.MdiParent = this;
            childForm.Name = "ChildForm - " + DateTime.Now.Millisecond.ToString();
            childForm.Text = childForm.Name;
            childForm.Show();
        }
    }
}

最终效果如下图示：

说明：我这里为了体现分割器，故将其背景色设为红色，便于大家观察，这种解决方案与之前的解决方案功能上是相同的，但有一点小小区别，之前的解决方案中子窗口的标题栏是在父窗口的容器内，而本文的解决方案中子窗口在最大化后，子窗口的标题栏会与父窗口合并，如下图示，至于大家用哪种依实际场景。

后续时间我会继续研究winform关于插件式编程（近期工作任务要求），到时候同样会分享给大家，也欢迎大家一起交流，当然高手可以无视。