C# ListView 鼠標滑動實現多選

Bertha 。 2022-06-17 11:48 131阅读 0赞

protected override void OnMouseMove(MouseEventArgs e)  
        \{  
            if (IsMousePress)  
            \{                 
                ListViewItem Curentterm=this.GetItemAt(e.X,e.Y);  
                int Ind = this.Items.IndexOf(Curentterm);  
                if (Ind < 0)  
                \{  
                    Ind = 0;  
                \}  
                if(StartInd>-1)  
                \{  
                    if (Ind > StartInd)  
                    \{  
                        if (!IsMoveDown)  
                        \{  
                            ///這點在起始節點上不選，在起始節點下選  
                            if (StartInd < StartMoveInd)  
                            \{  
                                this.Items\[StartInd\].Selected = false;  
                            \}  
                            else  
                            \{  
                                this.Items\[StartInd\].Selected = true;  
                            \}  
                        \}  
                        SelectTerms(StartInd+1, Ind);  
                        StartInd = Ind;  
                        IsMoveDown = true;  
                    \}  
                    else if (Ind < StartInd)  
                    \{    
                        if (IsMoveDown)  
                        \{                            
                            if (StartInd > StartMoveInd)  
                            \{  
                                this.Items\[StartInd\].Selected = false;  
                            \}  
                            else  
                            \{  
                                this.Items\[StartInd\].Selected = true;  
                            \}  
                        \}  
                        SelectTerms(Ind, StartInd-1);  
                        StartInd = Ind;  
                        IsMoveDown = false;  
                    \}  
                     
                \}  
                this.Refresh();  
            \}             
            base.OnMouseMove(e);  
        \}  
  
        private void SelectTerms(int Start, int End)  
        \{  
            if (Start < 0)  
            \{  
                Start = 0;  
            \}  
            for(int i=Start;i<=End;i++)  
            \{  
                if (i == StartMoveInd)  
                \{  
                    this.Items\[i\].Selected = true;//起始項始終選擇  
                    continue;  
                \}  
                if (this.Items\[i\].Selected)  
                \{  
                    this.Items\[i\].Selected = false;  
                \}  
                else  
                \{  
                    this.Items\[i\].Selected = true;  
                \}  
            \}  
        \}  
        protected override void OnMouseDown(MouseEventArgs e)  
        \{  
            if (e.Button == MouseButtons.Left)  
            \{  
                IsMousePress = true;  
            \}  
            ListViewItem Curentterm = this.GetItemAt(e.X, e.Y);  
            StartInd = this.Items.IndexOf(Curentterm);  
            StartMoveInd = StartInd;  
            base.OnMouseDown(e);  
        \}  
        protected override void OnMouseUp(MouseEventArgs e)  
        \{  
            if (e.Button == MouseButtons.Left)  
            \{  
                IsMousePress = false;  
            \}            
            IsMoveDown = true;//默認向下移動  
            StartInd = -1;  
            StartMoveInd = -1;  
            base.OnMouseUp(e);