Beispiel #1
0
        /// <summary>
        /// Calculate an acceptable position of the DropDownForm even in a
        /// multi screen environment.
        /// </summary>
        /// <param name="DropDown"></param>
        /// <returns></returns>
        private Point GetDropDownPosition(DropDownForm DropDown)
        {
            Point     lt     = Parent.PointToScreen(new Point(Left, Top));
            Point     rb     = Parent.PointToScreen(new Point(Right, Bottom));
            Rectangle screen = Screen.FromControl(this).Bounds;
            Point     point  = new Point();

            if (((lt.X + DropDown.Width) > (screen.X + screen.Width)) && ((rb.X - DropDown.Width) >= screen.X))
            {
                point.X = rb.X - DropDown.Width;

                if ((point.X + DropDown.Width) > (screen.X + screen.Width))
                {
                    point.X = ((screen.X + screen.Width) - DropDown.Width);
                }
            }
            else
            {
                point.X = lt.X;

                if (point.X < screen.X)
                {
                    point.X = screen.X;
                }
            }

            if (((rb.Y + DropDown.Height) > (screen.Y + screen.Height)) && ((lt.Y - DropDown.Height) >= screen.Y))
            {
                point.Y = lt.Y - DropDown.Height;

                if (point.Y < screen.Y)
                {
                    point.Y = screen.Y;
                }
            }
            else
            {
                point.Y = rb.Y;

                if ((point.Y + DropDown.Height) > (screen.Y + screen.Height))
                {
                    point.Y = ((screen.Y + screen.Height) - DropDown.Height);
                }
            }

            return(point);
        }
Beispiel #2
0
        /// <summary>
        /// We make our DropDownForm host the choosen control and show it instead
        /// of the dropdown portion of the ComboBox.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Combo_DropDown(object sender, EventArgs e)
        {
            if (!_dropDownHelper.DropDownShowing)
            {
                DropDownForm dropDown = new DropDownForm(_dropDownControl);

                dropDown.FinishEditing += new DropDownValueChangedEventHandler(DropDown_FinishEditing);
                dropDown.ValueChanged  += new DropDownValueChangedEventHandler(DropDown_ValueChanged);

                combo.DroppedDown = false;
                _dropDownHelper.ShowDropDown(_owner, dropDown, GetDropDownPosition(dropDown));
            }
            else
            {
                _dropDownHelper.CloseDropDown();
                this.Focus();
            }
        }