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Change context menu handling of SvTreeListBox

Status quo

When using the Right-Mouse-Button to rise up the context menu, the context always applies to the last selected entry/entries. Thus when the selection is not actual visible, it is not clear to which entry/entries the menu belongs to. In addition, the menu may be opened far away from the selection which it refers to.

When rising up the context menu by keyboard (shift-F10), the menu is placed at the actual mouse position and not at the position where the selected entry is/entries are located.

How it will be

Handling right mouse button click

  • Click over any entry.

    Previously selected entry/entries will be deselected. The entry under the mouse position is selected and used as context.

  • Click in empty arrea

    For single selectable SvTreeListBoxes: no context menu

    For multi selectable SvTreeListBoxes: Actual selection is cleared and a menu with empty context is used.

Handling context menu request by keyboard

  • No entry selected

    Empty context is used. Position of context menu will be the upper left corner of the list box.

  • One entry selected, entry visible

    Position of menu in the middle of the entry.

  • One entry selected, entry is invisible

    Entry will be made visible, position of menu again is the middle of the entry.

  • More than one entry is selected, no entry is visible

    The first selected entry is made visible and the position of menu again is the middle of the entry.

  • More than one entry is selected, one or more entries are visible

    The position of menu is the middle of the first visible selected entry.

  • Focused entry is not selected

    The focused entry is ignored.