Graphics.UI.Gtk.Misc.Tooltip

Add tips to your widgets

• Module available since Gtk+ version 2.12

Detail

Tooltip belongs to the new tooltips API that was introduced in Gtk+ 2.12 and which deprecates the old Tooltips API.

Basic tooltips can be realized simply by using widgetTooltipText or widgetTooltipMarkup without any explicit tooltip object.

When you need a tooltip with a little more fancy contents, like adding an image, or you want the tooltip to have different contents per TreeView row or cell, you will have to do a little more work:

• Set the hasTooltip property to True, this will make GTK+ monitor the widget for motion and related events which are needed to determine when and where to show a tooltip.
• Connect to the queryTooltip signal. This signal will be emitted when a tooltip is supposed to be shown. One of the arguments passed to the signal handler is a Tooltip object. This is the object that we are about to display as a tooltip, and can be manipulated in your callback using functions like tooltipSetIcon. There are functions for setting the tooltip's markup, setting an image from a stock icon, or even putting in a custom widget.
• Return True from your query-tooltip handler. This causes the tooltip to be show. If you return False, it will not be shown.

In the probably rare case where you want to have even more control over the tooltip that is about to be shown, you can set your own Window which will be used as tooltip window. This works as follows:

• Set hasTooltip and connect to queryTooltip as before.
• Use widgetSetTooltipWindow to set a Window created by you as tooltip window.
• In the queryTooltip callback you can access your window using widgetGetTooltipWindow and manipulate as you wish. The semantics of the return value are exactly as before, return True to show the window, False to not show it.

Class Hierarchy

| GObject
| +----Tooltip

Types

data Tooltip

Instances

Eq Tooltip

Ord Tooltip

GObjectClass Tooltip

TooltipClass Tooltip

class GObjectClass o => TooltipClass o

Instances

TooltipClass StatusIcon

TooltipClass Tooltip

castToTooltip :: GObjectClass obj => obj -> Tooltip

toTooltip :: TooltipClass o => o -> Tooltip

Methods

tooltipSetMarkup

Arguments

:: (TooltipClass self, GlibString markup)

=> self

-> Maybe markup

markup - a markup string (see Pango markup format) or Nothing

-> IO ()

Sets the text of the tooltip to be markup, which is marked up with the Pango text markup language. If markup is Nothing, the label will be hidden.

tooltipSetText

Arguments

:: (TooltipClass self, GlibString string)

=> self

-> Maybe string

text - a text string or Nothing

-> IO ()

Sets the text of the tooltip to be text. If text is Nothing the label will be hidden. See also tooltipSetMarkup.

tooltipSetIcon

Arguments

:: TooltipClass self

=> self

-> Maybe Pixbuf

pixbuf - a Pixbuf or Nothing

-> IO ()

Sets the icon of the tooltip (which is in front of the text) to be pixbuf. If pixbuf is Nothing the image will be hidden.

tooltipSetIconFromStock

Arguments

:: (TooltipClass self, GlibString string)

=> self

-> Maybe string

id a stock id, or Nothing

-> IconSize

size a stock icon size

-> IO ()

Sets the icon of the tooltip (which is in front of the text) to be the stock item indicated by stockId with the size indicated by size. If stockId is Nothing the image will be hidden.

tooltipSetIconFromIconName

Arguments

:: (TooltipClass self, GlibString string)

=> self

-> Maybe string

iconName an icon name, or Nothing

-> IconSize

size a stock icon size

-> IO ()

Sets the icon of the tooltip (which is in front of the text) to be the icon indicated by iconName with the size indicated by size. If iconName is Nothing the image will be hidden.

• Available since Gtk+ version 2.14

tooltipSetCustom

Arguments

:: (TooltipClass self, WidgetClass widget)

=> self

-> Maybe widget

customWidget a Widget, or Nothing to unset the old custom widget.

-> IO ()

Replaces the widget packed into the tooltip with customWidget. customWidget does not get destroyed when the tooltip goes away. By default a box with a Image and Label is embedded in the tooltip, which can be configured using tooltipSetMarkup and tooltipSetIcon.

tooltipTriggerTooltipQuery

Arguments

:: Display

display - a Display

-> IO ()

Triggers a new tooltip query on display, in order to update the current visible tooltip, or to show/hide the current tooltip. This function is useful to call when, for example, the state of the widget changed by a key press.

tooltipSetTipArea :: TooltipClass self => self -> Rectangle -> IO ()

Sets the area of the widget, where the contents of this tooltip apply, to be rect (in widget coordinates). This is especially useful for properly setting tooltips on TreeView rows and cells, IconView

For setting tooltips on TreeView, please refer to the convenience functions for this: treeViewSetTooltipRow and treeViewSetTooltipCell.

tooltipSetIconFromGIcon

Arguments

:: TooltipClass self

=> self

-> Maybe Icon

gicon a GIcon representing the icon, or Nothing. allow-none.

-> IconSize

-> IO ()

Sets the icon of the tooltip (which is in front of the text) to be the icon indicated by gicon with the size indicated by size. If gicon is Nothing, the image will be hidden.