Class: Gtk::CellAreaContext
- Inherits:
-
Object
- Object
- Gtk::CellAreaContext
- Defined in:
- (unknown)
Instance Method Summary collapse
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#allocate(width, height) ⇒ nil
Allocates a width and/or a height for all rows which are to be rendered with context.
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#area ⇒ Gtk::CellArea
The Gtk::CellArea this context was created by.
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#area=(area) ⇒ Gtk::CellArea
The Gtk::CellArea this context was created by.
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#get_allocation(width, height) ⇒ nil
Fetches the current allocation size for context.
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#get_preferred_height(minimum_height, natural_height) ⇒ nil
Gets the accumulative preferred height for all rows which have been requested with this context.
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#get_preferred_height_for_width(width, minimum_height, natural_height) ⇒ nil
Gets the accumulative preferred height for width for all rows which have been requested for the same said width with this context.
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#get_preferred_width(minimum_width, natural_width) ⇒ nil
Gets the accumulative preferred width for all rows which have been requested with this context.
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#get_preferred_width_for_height(height, minimum_width, natural_width) ⇒ nil
Gets the accumulative preferred width for height for all rows which have been requested for the same said height with this context.
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#minimum_height ⇒ Integer
The minimum height for the Gtk::CellArea in this context for all Gtk::TreeModel rows that this context was requested for using gtk_cell_area_get_preferred_height().
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#minimum_height=(minimum_height) ⇒ Integer
The minimum height for the Gtk::CellArea in this context for all Gtk::TreeModel rows that this context was requested for using gtk_cell_area_get_preferred_height().
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#minimum_width ⇒ Integer
The minimum width for the Gtk::CellArea in this context for all Gtk::TreeModel rows that this context was requested for using gtk_cell_area_get_preferred_width().
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#minimum_width=(minimum_width) ⇒ Integer
The minimum width for the Gtk::CellArea in this context for all Gtk::TreeModel rows that this context was requested for using gtk_cell_area_get_preferred_width().
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#natural_height ⇒ Integer
The natural height for the Gtk::CellArea in this context for all Gtk::TreeModel rows that this context was requested for using gtk_cell_area_get_preferred_height().
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#natural_height=(natural_height) ⇒ Integer
The natural height for the Gtk::CellArea in this context for all Gtk::TreeModel rows that this context was requested for using gtk_cell_area_get_preferred_height().
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#natural_width ⇒ Integer
The natural width for the Gtk::CellArea in this context for all Gtk::TreeModel rows that this context was requested for using gtk_cell_area_get_preferred_width().
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#natural_width=(natural_width) ⇒ Integer
The natural width for the Gtk::CellArea in this context for all Gtk::TreeModel rows that this context was requested for using gtk_cell_area_get_preferred_width().
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#push_preferred_height(minimum_height, natural_height) ⇒ nil
Causes the minimum and/or natural height to grow if the new proposed sizes exceed the current minimum and natural height.
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#push_preferred_width(minimum_width, natural_width) ⇒ nil
Causes the minimum and/or natural width to grow if the new proposed sizes exceed the current minimum and natural width.
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#reset ⇒ nil
Resets any previously cached request and allocation data.
Instance Method Details
#allocate(width, height) ⇒ nil
Allocates a width and/or a height for all rows which are to be rendered with context.
Usually allocation is performed only horizontally or sometimes vertically since a group of rows are usually rendered side by side vertically or horizontally and share either the same width or the same height. Sometimes they are allocated in both horizontal and vertical orientations producing a homogeneous effect of the rows. This is generally the case for Gtk::TreeView when Gtk::TreeView:fixed-height-mode is enabled.
Since 3.0
#area ⇒ Gtk::CellArea
The Gtk::CellArea this context was created by
#area=(area) ⇒ Gtk::CellArea
The Gtk::CellArea this context was created by
#get_allocation(width, height) ⇒ nil
Fetches the current allocation size for context.
If the context was not allocated in width or height, or if the context was recently reset with gtk_cell_area_context_reset(), the returned value will be -1.
#get_preferred_height(minimum_height, natural_height) ⇒ nil
Gets the accumulative preferred height for all rows which have been requested with this context.
After gtk_cell_area_context_reset() is called and/or before ever requesting the size of a Gtk::CellArea, the returned values are 0.
#get_preferred_height_for_width(width, minimum_height, natural_height) ⇒ nil
Gets the accumulative preferred height for width for all rows which have been requested for the same said width with this context.
After gtk_cell_area_context_reset() is called and/or before ever requesting the size of a Gtk::CellArea, the returned values are -1.
#get_preferred_width(minimum_width, natural_width) ⇒ nil
Gets the accumulative preferred width for all rows which have been requested with this context.
After gtk_cell_area_context_reset() is called and/or before ever requesting the size of a Gtk::CellArea, the returned values are 0.
#get_preferred_width_for_height(height, minimum_width, natural_width) ⇒ nil
Gets the accumulative preferred width for height for all rows which have been requested for the same said height with this context.
After gtk_cell_area_context_reset() is called and/or before ever requesting the size of a Gtk::CellArea, the returned values are -1.
#minimum_height ⇒ Integer
The minimum height for the Gtk::CellArea in this context for all Gtk::TreeModel rows that this context was requested for using gtk_cell_area_get_preferred_height().
#minimum_height=(minimum_height) ⇒ Integer
The minimum height for the Gtk::CellArea in this context for all Gtk::TreeModel rows that this context was requested for using gtk_cell_area_get_preferred_height().
#minimum_width ⇒ Integer
The minimum width for the Gtk::CellArea in this context for all Gtk::TreeModel rows that this context was requested for using gtk_cell_area_get_preferred_width().
#minimum_width=(minimum_width) ⇒ Integer
The minimum width for the Gtk::CellArea in this context for all Gtk::TreeModel rows that this context was requested for using gtk_cell_area_get_preferred_width().
#natural_height ⇒ Integer
The natural height for the Gtk::CellArea in this context for all Gtk::TreeModel rows that this context was requested for using gtk_cell_area_get_preferred_height().
#natural_height=(natural_height) ⇒ Integer
The natural height for the Gtk::CellArea in this context for all Gtk::TreeModel rows that this context was requested for using gtk_cell_area_get_preferred_height().
#natural_width ⇒ Integer
The natural width for the Gtk::CellArea in this context for all Gtk::TreeModel rows that this context was requested for using gtk_cell_area_get_preferred_width().
#natural_width=(natural_width) ⇒ Integer
The natural width for the Gtk::CellArea in this context for all Gtk::TreeModel rows that this context was requested for using gtk_cell_area_get_preferred_width().
#push_preferred_height(minimum_height, natural_height) ⇒ nil
Causes the minimum and/or natural height to grow if the new proposed sizes exceed the current minimum and natural height.
This is used by Gtk::CellAreaContext implementations during the request process over a series of Gtk::TreeModel rows to progressively push the requested height over a series of gtk_cell_area_get_preferred_height() requests.
#push_preferred_width(minimum_width, natural_width) ⇒ nil
Causes the minimum and/or natural width to grow if the new proposed sizes exceed the current minimum and natural width.
This is used by Gtk::CellAreaContext implementations during the request process over a series of Gtk::TreeModel rows to progressively push the requested width over a series of gtk_cell_area_get_preferred_width() requests.
#reset ⇒ nil
Resets any previously cached request and allocation data.
When underlying Gtk::TreeModel data changes its important to reset the context if the content size is allowed to shrink. If the content size is only allowed to grow (this is usually an option for views rendering large data stores as a measure of optimization), then only the row that changed or was inserted needs to be (re)requested with gtk_cell_area_get_preferred_width().
When the new overall size of the context requires that the allocated size changes (or whenever this allocation changes at all), the variable row sizes need to be re-requested for every row.
For instance, if the rows are displayed all with the same width from top to bottom then a change in the allocated width necessitates a recalculation of all the displayed row heights using gtk_cell_area_get_preferred_height_for_width().
Since 3.0