仿Office的程序载入窗体

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初次接触启动界面记不清是在哪一年了，估计是小学四年级第一次打开Office Word的时候吧，更记不清楚当时的启动界面是长啥样了。后来随着使用的软件越来越多，也见到各式各样的启动界面。下面就列举了两个平常本人平常最常见的窗体，其实windows系统在启动的过程中，有Window字样并且有动画效果的那个节面也算是一个启动界面。

其目的很明显，就是程序启动之后，由于加载主界面的时间过长而导致用户体验不佳，于是往往在显示主界面之前多显示一个不带windows窗体元素的窗体，来显示应用程序加载的进度或者直接是一个静态的视图，作用在于就是跟用户反映程序是有响应的并且正在运行当中，从而提高用户体验。下面是我的载入窗

主要是仿照了Office 2013的风格

简约明了。其中窗体的底色，字体，文字颜色可以更改，左上角的制造商，中间的软件名称，左下角的进度信息都可以更改。不过暂时还没有把图标附加到左上角而已。

窗体的设计如下所示

载入窗的制造商，软件名称这些信息通过构造函数传参进行设置，此外默认的构造函数被屏蔽了

private LoadingForm()
{
InitializeComponent();
} public LoadingForm(string logoStr, string appNameStr, string iniMsgStr):this()
{
this.lbLogo.Text = logoStr;
AppName = appNameStr;
this.lbMsg.Text = iniMsgStr;
this.picLoading.Width = this.Width; this.MouseDown+=new MouseEventHandler(LoadingForm_MouseDown);
foreach (Control con in this.Controls)
{
if (con.Equals(this.btnClose)) continue;
con.MouseDown += new MouseEventHandler(LoadingForm_MouseDown);
}
}

对窗体的打开并非用单纯的Show或者ShowDialog，因为在主线程上Show的话，本身主线程要加载时就会阻塞，这样再阻塞的线程上show的话，窗体难以显示。如果用ShowDialog的也不行，虽然它可以让窗体显示出来，但是调用了ShowDialog之后直到窗体关闭了才返回。就是说载入窗关闭了之后才执行载入加载之类的操作，这样显得毫无意义。

这里只是用来了一个异步去ShowDialog。代码如下

public void ShowLoading()
{
Action callback = new Action(delegate()
{
if (!this.IsDisposed)
this.ShowDialog();
});
callback.BeginInvoke(null, null);
}

这里在ShowDialog之前还多作了一个判断，在于关闭窗体的方法时释放了资源，因此在几个地方都要注意，关闭窗体的处理如下

public void CloseLoading()
{
if (!this.IsDisposed && this.IsHandleCreated)
{
this.Invoke((Action)delegate
{
this.Close();
this.Dispose(); });
}
}

由于调用了Invoke，这个需要判断当前窗体是否已经是显示了出来，否则就会因为窗体的句柄不存在而抛出异常。

在窗体上显示的进度信息，只是通过了一个外放的属性实现，其判断的用意跟关闭窗体时的一样。

public string Message {
get { return this.lbMsg.Text; }
set
{
if (!this.IsDisposed&&this.IsHandleCreated)
{
this.Invoke((Action)delegate()
{
this.lbMsg.Text = value;
});
}
}
}

为了窗体能具备可拖拽的效果，还额外加了一下的代码

[DllImport("user32.dll")]
private static extern bool ReleaseCapture();
[DllImport("user32.dll")]
private static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);
private const int WM_SYSCOMMAND = 0x0112;
private const int SC_MOVE = 0xF010;
private const int HTCAPTION = 0x0002; protected void LoadingForm_MouseDown(object sender, MouseEventArgs e)
{ ReleaseCapture();
SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, );
}

调用的形式如下

LoadingForm frm = new LoadingForm("HopeGi", "猴健工具集", "启动中...");
frm.ShowLoading();
//一系列操作
frm.Message = "加载界面...";
//一系列操作
frm.CloseLoading();

最近出了点状况，电脑很久也没碰了，前进的步伐缓了下来。能写出来的博客也不咋的，各位有什么好的建议和意见尽管提，谢谢！最后附上源码,可是用到的gif图片没附带上来

public partial class LoadingForm : Form
{ [DllImport("user32.dll")]
private static extern bool ReleaseCapture();
[DllImport("user32.dll")]
private static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);
private const int WM_SYSCOMMAND = 0x0112;
private const int SC_MOVE = 0xF010;
private const int HTCAPTION = 0x0002; private LoadingForm()
{
InitializeComponent();
} public LoadingForm(string logoStr, string appNameStr, string iniMsgStr):this()
{
this.lbLogo.Text = logoStr;
AppName = appNameStr;
this.lbMsg.Text = iniMsgStr;
this.picLoading.Width = this.Width; this.MouseDown+=new MouseEventHandler(LoadingForm_MouseDown);
foreach (Control con in this.Controls)
{
if (con.Equals(this.btnClose)) continue;
con.MouseDown += new MouseEventHandler(LoadingForm_MouseDown);
}
} public string Message {
get { return this.lbMsg.Text; }
set
{
if (!this.IsDisposed&&this.IsHandleCreated)
{
this.Invoke((Action)delegate()
{
this.lbMsg.Text = value;
});
}
}
} public void ShowLoading()
{
Action callback = new Action(delegate()
{
if (!this.IsDisposed)
this.ShowDialog();
});
callback.BeginInvoke(null, null);
} public void CloseLoading()
{
if (!this.IsDisposed && this.IsHandleCreated)
{
this.Invoke((Action)delegate
{
this.Close();
this.Dispose(); });
}
} private string AppName {
get { return this.lbAppName.Text; }
set {
this.lbAppName.Text = value;
this.lbAppName.Location = new Point((this.Width - this.lbAppName.Width) / , this.lbAppName.Location.Y);
}
} private void btnClose_Click(object sender, EventArgs e)
{
this.CloseLoading();
Environment.Exit();
} protected void LoadingForm_MouseDown(object sender, MouseEventArgs e)
{ ReleaseCapture();
SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, );
} #region Windows Form Designer generated code /// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.lbLogo = new System.Windows.Forms.Label();
this.lbAppName = new System.Windows.Forms.Label();
this.lbMsg = new System.Windows.Forms.Label();
this.btnClose = new System.Windows.Forms.PictureBox();
this.picLoading = new System.Windows.Forms.PictureBox();
((System.ComponentModel.ISupportInitialize)(this.btnClose)).BeginInit();
((System.ComponentModel.ISupportInitialize)(this.picLoading)).BeginInit();
this.SuspendLayout();
//
// lbLogo
//
this.lbLogo.AutoSize = true;
this.lbLogo.Font = new System.Drawing.Font("楷体", 12F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)()));
this.lbLogo.ForeColor = System.Drawing.Color.White;
this.lbLogo.Location = new System.Drawing.Point(, );
this.lbLogo.Name = "lbLogo";
this.lbLogo.Size = new System.Drawing.Size(, );
this.lbLogo.TabIndex = ;
this.lbLogo.Text = "LOGO";
//
// lbAppName
//
this.lbAppName.AutoSize = true;
this.lbAppName.Font = new System.Drawing.Font("黑体", 26.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)()));
this.lbAppName.ForeColor = System.Drawing.Color.White;
this.lbAppName.Location = new System.Drawing.Point(, );
this.lbAppName.Name = "lbAppName";
this.lbAppName.Size = new System.Drawing.Size(, );
this.lbAppName.TabIndex = ;
this.lbAppName.Text = "AppName\r\n";
//
// lbMsg
//
this.lbMsg.AutoSize = true;
this.lbMsg.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)()));
this.lbMsg.ForeColor = System.Drawing.Color.White;
this.lbMsg.Location = new System.Drawing.Point(, );
this.lbMsg.Name = "lbMsg";
this.lbMsg.Size = new System.Drawing.Size(, );
this.lbMsg.TabIndex = ;
this.lbMsg.Text = "label1";
//
// btnClose
//
this.btnClose.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
this.btnClose.Cursor = System.Windows.Forms.Cursors.Hand;
this.btnClose.Image = global::AllTypeTest.Properties.Resources.Delete;
this.btnClose.Location = new System.Drawing.Point(, );
this.btnClose.Name = "btnClose";
this.btnClose.Size = new System.Drawing.Size(, );
this.btnClose.SizeMode = System.Windows.Forms.PictureBoxSizeMode.Zoom;
this.btnClose.TabIndex = ;
this.btnClose.TabStop = false;
this.btnClose.Click += new System.EventHandler(this.btnClose_Click);
//
// picLoading
//
this.picLoading.Image = global::AllTypeTest.Properties.Resources.download;
this.picLoading.Location = new System.Drawing.Point(, );
this.picLoading.Name = "picLoading";
this.picLoading.Size = new System.Drawing.Size(, );
this.picLoading.SizeMode = System.Windows.Forms.PictureBoxSizeMode.Zoom;
this.picLoading.TabIndex = ;
this.picLoading.TabStop = false;
//
// LoadingForm
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.BackColor = System.Drawing.Color.ForestGreen;
this.ClientSize = new System.Drawing.Size(, );
this.Controls.Add(this.btnClose);
this.Controls.Add(this.lbMsg);
this.Controls.Add(this.picLoading);
this.Controls.Add(this.lbAppName);
this.Controls.Add(this.lbLogo);
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
this.Name = "LoadingForm";
this.ShowInTaskbar = false;
this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
this.Text = "LoadingForm";
this.TopMost = true;
((System.ComponentModel.ISupportInitialize)(this.btnClose)).EndInit();
((System.ComponentModel.ISupportInitialize)(this.picLoading)).EndInit();
this.ResumeLayout(false);
this.PerformLayout(); } #endregion private System.Windows.Forms.Label lbLogo;
private System.Windows.Forms.Label lbAppName;
private System.Windows.Forms.PictureBox picLoading;
private System.Windows.Forms.Label lbMsg;
private System.Windows.Forms.PictureBox btnClose; }