An FXMenuButton posts a popup menu when
clicked. There are many ways to control the placement where the popup will
appear; first, the popup may be placed on either of the four sides relative
to the menu button; this is controlled by the flags
MENUBUTTON_DOWN, etc. Next, there are several attachment modes;
the popup‘s left/bottom edge may attach to the menu button‘s
left/top edge, or the popup‘s right/top edge may attach to the menu
button‘s right/bottom edge, or both. Also, the popup may appear
centered relative to the menu button. Finally, a small offset may be
specified to displace the location of the popup by a few pixels so as to
account for borders and so on. Normally, the menu button shows an arrow
pointing to the direction where the popup is set to appear; this can be
turned off by passing the option MENUBUTTON_NOARROWS.
Events
The following messages are sent by FXMenuButton to its target:
SEL_KEYPRESS: | sent when a key goes down; the message data is an FXEvent instance.
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SEL_KEYRELEASE: | sent when a key goes up; the message data is an FXEvent instance.
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SEL_LEFTBUTTONPRESS: | sent when the left mouse button goes down; the message data is an FXEvent instance.
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SEL_LEFTBUTTONRELEASE: | sent when the left mouse button goes up; the message data is an FXEvent instance.
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Menu Button Style Flags
Any combination of the following flags can be assigned as the menu button
style flags.
MENUBUTTON_AUTOGRAY: | Automatically gray out when no target
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MENUBUTTON_AUTOHIDE: | Automatically hide when no target
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MENUBUTTON_TOOLBAR: | Toolbar style
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MENUBUTTON_NOARROWS: | Do not show arrows
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Menu Button Popup Style
Any one of the following options can be assigned as the menu button‘s
popup style.
MENUBUTTON_DOWN: | Popup window appears below menu button
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MENUBUTTON_UP: | Popup window appears above menu button
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MENUBUTTON_LEFT: | Popup window to the left of the menu button
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MENUBUTTON_RIGHT: | Popup window to the right of the menu button
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Menu Button Attachment
Any combination of the following flags can be assigned as the menu
button‘s attachment flags.
MENUBUTTON_ATTACH_LEFT: | Popup attaches to the left side of the menu button
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MENUBUTTON_ATTACH_TOP: | Popup attaches to the top of the menu button
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MENUBUTTON_ATTACH_RIGHT: | Popup attaches to the right side of the menu button
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MENUBUTTON_ATTACH_BOTTOM: | Popup attaches to the bottom of the menu button
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MENUBUTTON_ATTACH_CENTER: | Popup attaches to the center of the menu button
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MENUBUTTON_ATTACH_BOTH: | Popup attaches to both sides of the menu button
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