初學c# -- 學習筆記（五） winfrom自訂捲軸

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找了些例子，要麼龐大、要麼搞個安裝組件什麼的，我要求能用就行了。實在找例子修改麻煩，就做了一個。其實實現挺簡單，就是panel或圖片什麼的跟著滑鼠走就行了。

這裡panel自己可以加背景圖或直接搞個圖就行了。為了示範清楚，有個捲軸控制項做對比，與自訂的同步。

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 customscroll{    public partial class Form1 : Form    {        int limt, set_x; //滾動位置最大值和固定的左右的位置        bool mouse_Press = false; //滑鼠按下        bool mouse_Wheel = false; //滑輪是否滾動        Point mouseOff; //存放當前滑鼠位置        public Form1()        {            InitializeComponent();            //向panel填充一堆內容            for (int i = 0; i < 25; i++)            {                Panel num_panel = new Panel();                Label num = new Label();                num.Text = i + ".";                num.ForeColor = Color.FromArgb(255, 255, 255);                num.Width = 30;                num.Dock = DockStyle.Left;                //設定滑鼠滑輪事件，需將mouse_Wheel 值為true，在move裡置，下面有，這裡就不寫了                //num.MouseWheel += new MouseEventHandler(OnMouseWheel);                num_panel.Name = "Panel_" + i;                num_panel.Height = 35;                num_panel.Margin = new Padding(0, 0, 0, 0);                num_panel.BackColor = Color.SteelBlue;                num_panel.BorderStyle = BorderStyle.Fixed3D;                num_panel.Dock = DockStyle.Top;                num_panel.BorderStyle = System.Windows.Forms.BorderStyle.None;                num_panel.Controls.Add(num);                //設定滑鼠滑輪事件，需將mouse_Wheel 值為true，在move裡置，下面有，這裡就不寫了                //num_panel.MouseWheel += new MouseEventHandler(OnMouseWheel);                Content_panel.Controls.Add(num_panel); //將內容裝入                //設定滑鼠滑輪事件，需將mouse_Wheel 值為true，在move裡置，下面有，這裡就不寫了                //Content_panel.MouseWheel += new MouseEventHandler(OnMouseWheel);            }            //裝內容panel自動大小            Content_panel.AutoSize = true;            set_x = ScrollHard_panel.Location.X; //固定左右位置為當前位置            limt = ScrollBar_panel.Height - ScrollHard_panel.Height; //滾動最大高度            ScrollHard_panel.Location = new Point(set_x,0) ; //先將位置設定到最頂            vScrollBar1.Maximum = limt; //放了個vScrollBar組件，示範用的，和自訂的同步            //滑鼠滑輪事件            ScrollBar_panel.MouseWheel += new MouseEventHandler(OnMouseWheel);            ScrollHard_panel.MouseWheel += new MouseEventHandler(OnMouseWheel);            vScrollBar1.MouseWheel += new MouseEventHandler(OnMouseWheel);        }        //滑鼠滑輪事件        private void OnMouseWheel(object sender, System.Windows.Forms.MouseEventArgs e)        {            int set_y = 0;            if (mouse_Wheel) //是否判斷滑鼠滑輪            {                if (e.Delta > 0) //滑輪向上                {                    set_y = ScrollHard_panel.Location.Y - 10; //每次移動10                    if (set_y < 0) { set_y = 0;  } //超範圍                }                if (e.Delta < 0)  //滑輪向下                {                    set_y = ScrollHard_panel.Location.Y + 10; //每次移動10                    if (set_y > limt) { set_y = limt; } //超範圍                }                ScrollHard_panel.Location = new Point(set_x, set_y); //滾動塊的定位                vScrollBar1.Value = set_y; //示範用的捲軸，和自訂的同步                Content_panel.Top = -set_y; //裝內容的panel滾動顯示            }        }        //自訂滾動“塊”框滑鼠按下        private void ScrollHard_panel_MouseDown(object sender, MouseEventArgs e)        {            if (e.Button == MouseButtons.Left) //滑鼠左鍵            {                mouseOff.Y = e.Y;  //取當前位置                mouse_Press = true; //滑鼠按下            }        }        //自訂滾動“塊”滑鼠放開        private void ScrollHard_panel_MouseUp(object sender, MouseEventArgs e)        {            mouse_Press = false; //滑鼠放開        }        //自訂滾動“塊”滑鼠離開範圍        private void ScrollHard_panel_MouseLeave(object sender, EventArgs e)        {            mouse_Wheel = false; //滑輪不可用        }        ////自訂滾動“塊”滑鼠在範圍        private void ScrollHard_panel_MouseMove(object sender, MouseEventArgs e)        {            mouse_Wheel = true; //可以用滑輪            if (mouse_Press) //滑鼠按下狀態            {                int set_y = ScrollHard_panel.Top + e.Y - mouseOff.Y; //計算當前縱向座標                if (set_y < 0) { set_y = 0; } //超範圍                else if (set_y > limt) { set_y = limt; } //超範圍                else { ScrollHard_panel.Location = new Point(set_x, set_y); } //滾動塊的定位                vScrollBar1.Value = set_y; //示範的捲軸和自訂的同步                Content_panel.Top = -set_y; //裝內容的panel滾動顯示            }        }        //在滾動“框”範圍內        private void ScrollBar_panel_MouseMove(object sender, MouseEventArgs e)        {            mouse_Wheel = true;  //可以使用滑輪        }        //離開滾動“框”        private void ScrollBar_panel_MouseLeave(object sender, EventArgs e)        {            mouse_Wheel = false; //不可使用滑輪        }        //自訂滾動“框”滑鼠放開        private void ScrollBar_panel_MouseUp(object sender, MouseEventArgs e)        {            if (e.Button == MouseButtons.Left) //滑鼠左鍵            {                int set_y = e.Y; //當前縱座標                if (set_y > limt) { set_y = limt; } //超範圍                ScrollHard_panel.Location = new Point(set_x, set_y); //滾動塊定位                vScrollBar1.Value = set_y; //示範的捲軸，和自訂的同步                Content_panel.Top = -set_y;//裝內容的panel滾動顯示                mouse_Press = false; //滑鼠為放開狀態            }        }        //示範用的vScrollBar1組件，也可以控制裝內容的panel滾動顯示        private void vScrollBar1_Scroll(object sender, ScrollEventArgs e)        {            Content_panel.Top = -vScrollBar1.Value;        }    }}

 

初學c# -- 學習筆記（五） winfrom自訂捲軸