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Graphics.UI.Gtk.Display.ProgressBar | Portability | portable (depends on GHC) | Stability | provisional | Maintainer | gtk2hs-users@lists.sourceforge.net |
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Description |
A widget which indicates progress visually
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Synopsis |
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Detail
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The ProgressBar is typically used to display the progress of a long
running operation. It provides a visual clue that processing is underway.
The ProgressBar can be used in two different modes: percentage mode and
activity mode.
When an application can determine how much work needs to take place (e.g.
read a fixed number of bytes from a file) and can monitor its progress, it
can use the ProgressBar in percentage mode and the user sees a growing bar
indicating the percentage of the work that has been completed. In this mode,
the application is required to call progressBarSetFraction periodically to
update the progress bar.
When an application has no accurate way of knowing the amount of work to
do, it can use the ProgressBar in activity mode, which shows activity by a
block moving back and forth within the progress area. In this mode, the
application is required to call progressBarPulse perodically to update the
progress bar.
There is quite a bit of flexibility provided to control the appearance of
the ProgressBar. Functions are provided to control the orientation of the
bar, optional text can be displayed along with the bar, and the step size
used in activity mode can be set.
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Class Hierarchy
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| GObject
| +----Object
| +----Widget
| +----ProgressBar
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Types
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Constructors
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Creates a new ProgressBar.
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Methods
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Indicates that some progress is made, but you don't know how much. Causes
the progress bar to enter "activity mode", where a block bounces back and
forth. Each call to progressBarPulse causes the block to move by a little
bit (the amount of movement per pulse is determined by
progressBarSetPulseStep).
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Causes the given text to appear superimposed on the progress bar.
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:: ProgressBarClass self | | => self | fraction - fraction of the task that's been completed
| -> Double | | -> IO () | | Causes the progress bar to "fill in" the given fraction of the bar. The
fraction should be between 0.0 and 1.0, inclusive.
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:: ProgressBarClass self | | => self | returns a fraction from 0.0 to 1.0
| -> IO Double | | Returns the current fraction of the task that's been completed.
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:: ProgressBarClass self | | => self | returns text, or Nothing
| -> IO (Maybe String) | | Retrieves the text displayed superimposed on the progress bar, if any,
otherwise Nothing.
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data ProgressBarOrientation | Source |
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Is the ProgressBar horizontally or vertically
directed?
| Constructors | ProgressLeftToRight | | ProgressRightToLeft | | ProgressBottomToTop | | ProgressTopToBottom | |
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Causes the progress bar to switch to a different orientation
(left-to-right, right-to-left, top-to-bottom, or bottom-to-top).
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Retrieves the current progress bar orientation.
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Sets the mode used to ellipsize (add an ellipsis: "...") the text if
there is not enough space to render the entire string.
- Available since Gtk+ version 2.6
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Returns the ellipsizing position of the progressbar. See
progressBarSetEllipsize.
- Available since Gtk+ version 2.6
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Attributes
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Orientation and growth direction of the progress bar.
Default value: ProgressLeftToRight
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The number of discrete blocks in a progress bar (when shown in the
discrete style).
Allowed values: >= 2
Default value: 10
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The fraction of total work that has been completed.
Allowed values: [0,1]
Default value: 0
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The fraction of total progress to move the bouncing block when pulsed.
Allowed values: [0,1]
Default value: 0.1
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Text to be displayed in the progress bar.
Default value: "%P %%"
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The preferred place to ellipsize the string, if the progressbar does not
have enough room to display the entire string, specified as a
EllipsizeMode.
Note that setting this property to a value other than EllipsizeNone has
the side-effect that the progressbar requests only enough space to display
the ellipsis "...". Another means to set a progressbar's width is
Graphics.UI.Gtk.Abstract.Widget.widgetSetSizeRequest.
Default value: EllipsizeNone
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Produced by Haddock version 2.6.0 |