Graphics.UI.Gtk.Misc.Tooltip

gtk3-0.14.2: Binding to the Gtk+ 3 graphical user interface library

Maintainer | gtk2hs-users@lists.sourceforge.net
Stability | provisional
Portability | portable (depends on GHC)
Safe Haskell | None
Language | Haskell98

Graphics.UI.Gtk.Misc.Tooltip

Contents

- Detail
- Class Hierarchy
- Types
- Methods

Description

Add tips to your widgets

- Module available since Gtk+ version 2.12

Synopsis

- data Tooltip
- class GObjectClass o => TooltipClass o
- castToTooltip :: GObjectClass obj => obj -> Tooltip
- toTooltip :: TooltipClass o => o -> Tooltip
- tooltipSetMarkup :: (TooltipClass self, GlibString markup) => self -> Maybe markup -> IO ()
- tooltipSetText :: (TooltipClass self, GlibString string) => self -> Maybe string -> IO ()
- tooltipSetIcon :: TooltipClass self => self -> Maybe Pixbuf -> IO ()
- tooltipSetIconFromStock :: (TooltipClass self, GlibString string) => self -> Maybe string -> IconSize -> IO ()
- tooltipSetIconFromIconName :: (TooltipClass self, GlibString string) => self -> Maybe string -> IconSize -> IO ()
- tooltipSetCustom :: (TooltipClass self, WidgetClass widget) => self -> Maybe widget -> IO ()
- tooltipTriggerTooltipQuery :: Display -> IO ()
- tooltipSetTipArea :: TooltipClass self => self -> Rectangle -> IO ()

# 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`.