解決cefsharp在winform中不顯示tooltipText問題（網頁元素的title提示）

 1.監聽網頁屬性改變事件

webView.PropertyChanged += webView_PropertyChanged;

 

2.拖一個ToolTip控件到窗體

 

3.在webView_PropertyChanged這個事件處理函數中，獲取TooltipText並顯示出來

  //隱藏toolTip
                if (this.IsHandleCreated)
                {
                    this.BeginInvoke(new MethodInvoker(() =>
                    {
                        if (this.IsHandleCreated && !this.IsDisposed)
                        {
                            if (this.toolTip1.Active)
                            {
                                this.toolTip1.Hide(this);
                            }
                        }
                    }));
                }


                if (e.PropertyName == "TooltipText") //tooltipText改變事件
                {
                    string tooltipText = this.webView.TooltipText;
                    Point elementPos = new Point(Cursor.Position.X - this.Location.X, Cursor.Position.Y - this.Location.Y);
                    if (!String.IsNullOrEmpty(tooltipText))
                    {
                        this.Invoke(new MethodInvoker(() =>
                        {
                            System.Windows.Forms.Timer timer = new System.Windows.Forms.Timer();
                            timer.Interval = 600;
                            timer.Tick += (timer_sender, timer_e) =>
                            {
                                Point nowPos = new Point(Cursor.Position.X - this.Location.X, Cursor.Position.Y - this.Location.Y);
                                //if ((nowPos.X <= elementPos.X + 20 && nowPos.X >= elementPos.X - 20) && (nowPos.Y <= elementPos.Y + 20 && nowPos.Y >= elementPos.Y - 20)) //鼠標停留了500ms(范圍限定在一定范圍)
                                if (this.webView.TooltipText == tooltipText) //600毫秒后，tooltipText沒變
                                {
                                    this.toolTip1.Show(tooltipText, this, nowPos.X + 15, nowPos.Y + 15);
                                }
                                (timer_sender as System.Windows.Forms.Timer).Stop();
                                (timer_sender as System.Windows.Forms.Timer).Dispose();
                            };
                            timer.Start();

                        }));
                    }
                }