Struct gtk4::ProgressBar

source ·
#[repr(transparent)]
pub struct ProgressBar { /* private fields */ }
Expand description

ProgressBar is typically used to display the progress of a long running operation.

It provides a visual clue that processing is underway. ProgressBar can be used in two different modes: percentage mode and activity mode.

An example GtkProgressBar

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 set_fraction() 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 pulse() periodically 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.

CSS nodes

progressbar[.osd]
├── [text]
╰── trough[.empty][.full]
    ╰── progress[.pulse]

ProgressBar has a main CSS node with name progressbar and subnodes with names text and trough, of which the latter has a subnode named progress. The text subnode is only present if text is shown. The progress subnode has the style class .pulse when in activity mode. It gets the style classes .left, .right, .top or .bottom added when the progress ‘touches’ the corresponding end of the GtkProgressBar. The .osd class on the progressbar node is for use in overlays like the one Epiphany has for page loading progress.

Accessibility

ProgressBar uses the AccessibleRole::ProgressBar role.

Implements

WidgetExt, glib::ObjectExt, AccessibleExt, BuildableExt, ConstraintTargetExt, AccessibleRangeExt, OrientableExt, WidgetExtManual, AccessibleExtManual

Implementations§

Creates a new ProgressBar.

Returns

a ProgressBar.

Creates a new builder-pattern struct instance to construct ProgressBar objects.

This method returns an instance of ProgressBarBuilder which can be used to create ProgressBar objects.

Returns the ellipsizing position of the progress bar.

See set_ellipsize().

Returns

pango::EllipsizeMode

Returns the current fraction of the task that’s been completed.

Returns

a fraction from 0.0 to 1.0

Returns whether the progress bar is inverted.

Returns

true if the progress bar is inverted

Retrieves the pulse step.

See set_pulse_step().

Returns

a fraction from 0.0 to 1.0

Returns whether the ProgressBar shows text.

See set_show_text().

Returns

true if text is shown in the progress bar

Retrieves the text that is displayed with the progress bar.

The return value is a reference to the text, not a copy of it, so will become invalid if you change the text in the progress bar.

Returns

the text

Indicates that some progress has been 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 pulse() causes the block to move by a little bit (the amount of movement per pulse is determined by set_pulse_step()).

Sets the mode used to ellipsize the text.

The text is ellipsized if there is not enough space to render the entire string.

mode

a pango::EllipsizeMode

Causes the progress bar to “fill in” the given fraction of the bar.

The fraction should be between 0.0 and 1.0, inclusive.

fraction

fraction of the task that’s been completed

Sets whether the progress bar is inverted.

Progress bars normally grow from top to bottom or left to right. Inverted progress bars grow in the opposite direction.

inverted

true to invert the progress bar

Sets the fraction of total progress bar length to move the bouncing block.

The bouncing block is moved when pulse() is called.

fraction

fraction between 0.0 and 1.0

Sets whether the progress bar will show text next to the bar.

The shown text is either the value of the property::ProgressBar::text property or, if that is None, the property::ProgressBar::fraction value, as a percentage.

To make a progress bar that is styled and sized suitably for containing text (even if the actual text is blank), set property::ProgressBar::show-text to true and property::ProgressBar::text to the empty string (not None).

show_text

whether to show text

Causes the given @text to appear next to the progress bar.

If @text is None and property::ProgressBar::show-text is true, the current value of property::ProgressBar::fraction will be displayed as a percentage.

If @text is non-None and property::ProgressBar::show-text is true, the text will be displayed. In this case, it will not display the progress percentage. If @text is the empty string, the progress bar will still be styled and sized suitably for containing text, as long as property::ProgressBar::show-text is true.

text

a UTF-8 string

Trait Implementations§

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