一個具有默認值的TextBox的制作

╰+哭是因爲堅強的太久メ 2022-08-25 15:50 129阅读 0赞

一個具有默認值的TextBox的制作

原理:利用一個Label与一個TextBox結合,顏色設成一致.然后再處理相關事件達到效果.

在控件上放一個Label.  
this.borderLabel.BackColor = System.Drawing.SystemColors.Window;  
this.borderLabel.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;  
this.borderLabel.Cursor = System.Windows.Forms.Cursors.IBeam;  
this.borderLabel.Dock = System.Windows.Forms.DockStyle.Fill;  
this.borderLabel.ImageAlign = System.Drawing.ContentAlignment.MiddleLeft;  
this.borderLabel.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;  
this.borderLabel.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Italic, System.Drawing.GraphicsUnit.Point, ((byte)(238)));

this.borderLabel.MouseDown += new System.Windows.Forms.MouseEventHandler(this.borderLabel\_MouseDown);  
private void borderLabel\_MouseDown(object sender, MouseEventArgs e)  
\{  
textBox.Visible = true;  
textBox.Focus();  
\}

在Label的上方放一個TextBox  
this.textBox.BackColor = System.Drawing.SystemColors.Window;  
this.textBox.BorderStyle = System.Windows.Forms.BorderStyle.None;  
this.textBox.Location = new System.Drawing.Point(3, 5);  
this.textBox.Visible = false;  
this.textBox.Enter += new System.EventHandler(this.textBox\_Enter);  
this.textBox.Leave += new System.EventHandler(this.textBox\_Leave);

private void textBox\_Enter(object sender, EventArgs e)  
\{  
borderLabel.Image = null;  
//borderLabel.Text="";  
\}

private void textBox\_Leave(object sender, EventArgs e)  
\{  
if (textBox.Text.Length == 0)  
\{  
borderLabel.Image = searchProviders.ProviderImage;  
//borderLabel.Text="請輸入內容";  
textBox.Visible = false;  
\}  
\}