Gwyddion – Free SPM (AFM, SNOM/NSOM, STM, MFM, …) data analysis software

GwyPixmapLayer

GwyPixmapLayer — Base class for GwyDataView pixmap layers

Functions

gboolean gwy_pixmap_layer_wants_repaint ()
GdkPixbuf * gwy_pixmap_layer_paint ()
void gwy_pixmap_layer_set_data_key ()
const gchar * gwy_pixmap_layer_get_data_key ()
void gwy_pixmap_layer_make_pixbuf ()

Properties

gchar * data-key Read / Write

Types and Values

struct GwyPixmapLayer
struct GwyPixmapLayerClass

Object Hierarchy

    GObject
    ╰── GInitiallyUnowned
        ╰── GtkObject
            ╰── GwyDataViewLayer
                ╰── GwyPixmapLayer
                    ├── GwyLayerBasic
                    ╰── GwyLayerMask

Includes

#include <libgwydgets/gwydgets.h>

Description

GwyPixmapLayer is a base class for data field displaying GwyDataViewLayer's. It is a GwyDataView component and it is not normally usable outside of it.

The layer takes the data field to display from its parent GwyDataView. The key under which the data field is found must be set with gwy_pixmap_layer_set_data_key().

The other methods are only rarely needed outside GwyDataView implementation.

Functions

gwy_pixmap_layer_wants_repaint ()

gboolean
gwy_pixmap_layer_wants_repaint (GwyPixmapLayer *pixmap_layer);

Checks whether a pixmap layer wants repaint.

Parameters

pixmap_layer

A pixmap data view layer.

 

Returns

TRUE if the the layer wants repaint itself, FALSE otherwise.

gwy_pixmap_layer_paint ()

GdkPixbuf *
gwy_pixmap_layer_paint (GwyPixmapLayer *pixmap_layer);

Returns a pixbuf with painted pixmap layer.

This method does not enforce repaint. If the layer doesn't think it needs to repaint the pixbuf, it simply returns the current one. To enforce update, emit "data-changed" signal on corresponding data field.

Parameters

pixmap_layer

A pixmap data view layer.

 

Returns

The pixbuf. It should not be modified or freed. If the data field to draw is not present in the container, NULL is returned.

gwy_pixmap_layer_set_data_key ()

void
gwy_pixmap_layer_set_data_key (GwyPixmapLayer *pixmap_layer,
                               const gchar *key);

Sets the data field to display by a pixmap layer.

Parameters

pixmap_layer

A pixmap layer.

 

key

Container string key identifying the data field to display.

 

gwy_pixmap_layer_get_data_key ()

const gchar *
gwy_pixmap_layer_get_data_key (GwyPixmapLayer *pixmap_layer);

Gets the key identifying data field this pixmap layer displays.

Parameters

pixmap_layer

A pixmap layer.

 

Returns

The string key, or NULL if it isn't set.

gwy_pixmap_layer_make_pixbuf ()

void
gwy_pixmap_layer_make_pixbuf (GwyPixmapLayer *pixmap_layer,
                              gboolean has_alpha);

Creates or resizes pixmap layer GdkPixbuf to match its data field.

This method is intended for pixmap layer implementation.

Parameters

pixmap_layer

A pixmap layer.

 

has_alpha

Whether pixbuf should have alpha channel.

 

Types and Values

struct GwyPixmapLayer

struct GwyPixmapLayer;

struct GwyPixmapLayerClass

struct GwyPixmapLayerClass {
    GwyDataViewLayerClass parent_class;

    GdkPixbuf* (*paint)(GwyPixmapLayer *layer);

    void (*reserved1)(void);
    void (*reserved2)(void);
};

Property Details

The “data-key” property

  “data-key”                 gchar *

The :data-key property is the container key used to identify displayed GwyDataField in container.

Flags: Read / Write

Default value: NULL

© David Nečas and Petr Klapetek

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