闲来无事，打算写一系列winform入门相关的小软件，算是对自己技术的一个复习和备忘，也希望能帮助刚入门的萌新(可能也帮不到，因为没有注释)
第一期先用winform最大限度的还原QQ的登录界面，下图左侧是仿真的，右侧是QQ的界面，很明显能看出来高仿的和正版的区别，哈哈！
这是效果展示
接下来直接上代码
1.创建一个winform窗体，将窗体设置为无边框
2.右上角控制按钮的设置，使用Button即可，设置宽高和FlatStyle,三个按钮的背景图片去阿里巴巴图库上下载自己喜欢的png格式图片
按钮样式设置如下
3.左上角的QQ小企鹅也是阿里巴巴图库下载，QQ两个字使用label即可，字体设置为华文细黑
4.接下来是上半部分蓝色的背景，可以使用背景图片，此处我是在窗体的Paint事件中用的gdi+自己重绘了一个简单的渐变色（注释是不可能有的）
1 private void LoginForm_Paint(object sender, PaintEventArgs e)
2 {
3 Graphics graphics = e.Graphics;
4 Rectangle rectangle = new Rectangle(0, 0, 218, 125);
5 Color fromColor = Color.FromArgb(66, 84, 255);
6 Color toColor = Color.FromArgb(124, 228, 255);
7 Brush brush = new LinearGradientBrush(rectangle, fromColor, toColor, LinearGradientMode.ForwardDiagonal);
8 graphics.FillRectangle(brush, rectangle);
9
10
11 Rectangle rectangle1 = new Rectangle(218, 0, 218, 125);
12 Brush brush1 = new LinearGradientBrush(rectangle1, fromColor, toColor, LinearGradientMode.BackwardDiagonal);
13 graphics.FillRectangle(brush1, rectangle1);
14
15 }
5.头像部分是使用了一个PictureBox，圆角有两种实现方式，一种是找png格式的圆角图片，此处我是用的是修改PictureBox的Region的方式
1 private void LoginForm_Load(object sender, EventArgs e)
2 {
3 GraphicsPath graphicsPath = new GraphicsPath();
4 graphicsPath.AddEllipse(this.picHead.ClientRectangle);
5 this.picHead.Region = new Region(graphicsPath);
6 }
6.中间的账号密码部分分为3部分，1.左右的小图标，同样是下载图片使用PictureBox；2.文本输入部分使用TextBox,设置无边框，调整字体和字号;3.下划线，通过GDI+重绘
重绘代码如下（不好意思，这个竟然有注释，我一定改掉这个坏毛病 ）
1 private bool qqTxtFocus = false; 2 private bool pwdTxtFocus = false; 3 private bool qqTxtHover = false; 4 private bool pwdTxtHover = false;
1 private void pnlInput_Paint(object sender, PaintEventArgs e)
2 {
3 //绘制QQ号下方横线
4 Graphics g = e.Graphics;
5 Color qqUnderline;
6 if (qqTxtFocus)
7 {
8 qqUnderline = Color.DodgerBlue;
9 }
10 else
11 {
12 if (qqTxtHover)
13 qqUnderline = Color.Gray;
14 else
15 qqUnderline = Color.LightGray;
16 }
17 Pen qqPen = new Pen(qqUnderline, 1);
18
19 g.DrawLine(qqPen, 5, 35, pnlInput.Width - 5, 35);
20 //绘制密码下方横线
21 Color pwdUnderline;
22 if (pwdTxtFocus)
23 {
24 pwdUnderline = Color.DodgerBlue;
25 }
26 else
27 {
28 if (pwdTxtHover)
29 pwdUnderline = Color.Gray;
30 else
31 pwdUnderline = Color.LightGray;
32 }
33
34 Pen pwdPen = new Pen(pwdUnderline, 1);
35 g.DrawLine(pwdPen, 5, 79, pnlInput.Width - 5, 79);
36 }
7.以下代码是实现文本框选中和鼠标悬浮的变化控制
1 private void txtQQ_Enter(object sender, EventArgs e)
2 {
3 picQQ.BackgroundImage = Resources.sqqfocus;
4 qqTxtFocus = true;
5 this.pnlInput.Refresh();
6 }
7 private void txtQQ_Leave(object sender, EventArgs e)
8 {
9 picQQ.BackgroundImage = Resources.sqq;
10 qqTxtFocus = false;
11 this.pnlInput.Refresh();
12 }
13 private void txtQQ_MouseEnter(object sender, EventArgs e)
14 {
15 qqTxtHover = true;
16 this.pnlInput.Refresh();
17 }
18 private void txtQQ_MouseLeave(object sender, EventArgs e)
19 {
20 qqTxtHover = false;
21 this.pnlInput.Refresh();
22 }
23 private void txtPwd_Enter(object sender, EventArgs e)
24 {
25 picLock.BackgroundImage = Resources.pwdfocus;
26 pwdTxtFocus = true;
27 this.pnlInput.Refresh();
28 }
29 private void txtPwd_Leave(object sender, EventArgs e)
30 {
31 picLock.BackgroundImage = Resources.pwd;
32 pwdTxtFocus = false;
33 this.pnlInput.Refresh();
34 }
35
36 private void txtPwd_MouseEnter(object sender, EventArgs e)
37 {
38 pwdTxtHover = true;
39 this.pnlInput.Refresh();
40 }
41
42 private void txtPwd_MouseLeave(object sender, EventArgs e)
43 {
44 pwdTxtHover = false;
45 this.pnlInput.Refresh();
46 }
8.登录按钮鼠标悬浮和移出的变化控制
1 private void btnLogin_MouseEnter(object sender, EventArgs e)
2 {
3 btnLogin.BackgroundImage = Resources.btn1;
4 }
5
6 private void btnLogin_MouseLeave(object sender, EventArgs e)
7 {
8 btnLogin.BackgroundImage = Resources.btn2;
9 }
9.最后，就是设置和最小化按钮鼠标悬浮的半透明背景的实现，此效果也可用替换对应背景图片的方式实现
1 private bool settingHover = false;
2 private bool minHover = false;
3 private void btnMin_Paint(object sender, PaintEventArgs e)
4 {
5 Graphics g = e.Graphics;
6 Rectangle rectangle = btnMin.ClientRectangle;
7 if (minHover)
8 {
9 SolidBrush solidBrush = new SolidBrush(Color.FromArgb(50, 255, 255, 255));
10 g.FillRectangle(solidBrush, rectangle);
11 }
12 else
13 {
14 SolidBrush solidBrush = new SolidBrush(Color.FromArgb(0, 255, 255, 255));
15 g.FillRectangle(solidBrush, rectangle);
16 }
17 }
18 private void btnMin_MouseEnter(object sender, EventArgs e)
19 {
20 minHover = true;
21 btnMin.Refresh();
22 }
23 private void btnMin_MouseLeave(object sender, EventArgs e)
24 {
25 minHover = false;
26 btnMin.Refresh();
27 }
28 private void btnSetting_Paint(object sender, PaintEventArgs e)
29 {
30 Graphics g = e.Graphics;
31 Rectangle rectangle = btnSetting.ClientRectangle;
32 if (settingHover)
33 {
34 SolidBrush solidBrush = new SolidBrush(Color.FromArgb(50, 255, 255, 255));
35 g.FillRectangle(solidBrush, rectangle);
36 }
37 else
38 {
39 SolidBrush solidBrush = new SolidBrush(Color.FromArgb(0, 255, 255, 255));
40 g.FillRectangle(solidBrush, rectangle);
41 }
42 }
43
44 private void btnSetting_MouseEnter(object sender, EventArgs e)
45 {
46 settingHover = true;
47 btnSetting.Refresh();
48 }
49 private void btnSetting_MouseLeave(object sender, EventArgs e)
50 {
51 settingHover = false;
52 btnSetting.Refresh();
53 }
10.最最后，鼠标拖拽移动窗体位置代码
1 private Point point;
2 private void LoginForm_MouseDown(object sender, MouseEventArgs e)
3 {
4 if (e.Button == MouseButtons.Left)
5 {
6 point = new Point(e.X, e.Y);
7 }
8 }
9
10 private void LoginForm_MouseMove(object sender, MouseEventArgs e)
11 {
12 if (e.Button == MouseButtons.Left)
13 {
14 int diffX = e.X - point.X;
15 int diffY = e.Y - point.Y;
16 this.Location = new Point(this.Location.X + diffX, this.Location.Y + diffY);
17 }
18 }
end.代码终于复制完了，废话没有，收工。
标签：QQ,sender,C#,void,object,private,新手入门,Color,EventArgs From： https://www.cnblogs.com/ngcblog/p/17331627.html