mirror of
https://git.pwmt.org/pwmt/zathura.git
synced 2024-11-10 23:43:46 +01:00
104 lines
3.5 KiB
C
104 lines
3.5 KiB
C
/* See LICENSE file for license and copyright information */
|
|
|
|
#ifndef ZATHURA_ADJUSTMENT_H
|
|
#define ZATHURA_ADJUSTMENT_H
|
|
|
|
#include <gtk/gtk.h>
|
|
#include <stdbool.h>
|
|
#include "document.h"
|
|
|
|
/**
|
|
* Calculate the page size according to the corrent scaling and rotation if
|
|
* desired.
|
|
*
|
|
* @param document the document
|
|
* @param height width the original height and width
|
|
* @return page_height page_width the scaled and rotated height and width
|
|
* @param rotate honor page's rotation
|
|
* @return real scale after rounding
|
|
*/
|
|
double page_calc_height_width(zathura_document_t* document, double height, double width,
|
|
unsigned int* page_height, unsigned int* page_width, bool rotate);
|
|
|
|
/**
|
|
* Calculate a page relative position after a rotation. The positions x y are
|
|
* relative to a page, i.e. 0=top of page, 1=bottom of page. They are NOT
|
|
* relative to the entire document.
|
|
*
|
|
* @param document the document
|
|
* @param x y the x y coordinates on the unrotated page
|
|
* @param xn yn the x y coordinates after rotation
|
|
*/
|
|
void page_calc_position(zathura_document_t* document, double x, double y,
|
|
double *xn, double *yn);
|
|
|
|
/**
|
|
* Converts a relative position within the document to a page number.
|
|
*
|
|
* @param document The document
|
|
* @param pos_x pos_y the position relative to the document
|
|
* @return page sitting in that position
|
|
*/
|
|
unsigned int position_to_page_number(zathura_document_t* document,
|
|
double pos_x, double pos_y);
|
|
|
|
/**
|
|
* Converts a page number to a position in units relative to the document
|
|
*
|
|
* We can specify where to aliwn the viewport and the page. For instance, xalign
|
|
* = 0 means align them on the left margin, xalign = 0.5 means centered, and
|
|
* xalign = 1.0 align them on the right margin.
|
|
*
|
|
* The return value is the position in in units relative to the document (0=top
|
|
* 1=bottom) of the point thet will lie at the center of the viewport.
|
|
*
|
|
* @param document The document
|
|
* @param page_number the given page number
|
|
* @param xalign yalign where to align the viewport and the page
|
|
* @return pos_x pos_y position that will lie at the center of the viewport.
|
|
*/
|
|
void page_number_to_position(zathura_document_t* document, unsigned int page_number,
|
|
double xalign, double yalign, double *pos_x, double *pos_y);
|
|
|
|
/**
|
|
* Checks whether a given page falls within the viewport
|
|
*
|
|
* @param document The document
|
|
* @param page_number the page number
|
|
* @return true if the page intersects the viewport
|
|
*/
|
|
bool page_is_visible(zathura_document_t *document, unsigned int page_number);
|
|
|
|
/**
|
|
* Set the adjustment value while enforcing its limits
|
|
*
|
|
* @param adjustment Adjustment instance
|
|
* @param value Adjustment value
|
|
*/
|
|
void zathura_adjustment_set_value(GtkAdjustment* adjustment, gdouble value);
|
|
|
|
/**
|
|
* Compute the adjustment ratio
|
|
*
|
|
* That is, the ratio between the length from the lower bound to the middle of
|
|
* the slider, and the total length of the scrollbar.
|
|
*
|
|
* @param adjustment Scrollbar adjustment
|
|
* @return Adjustment ratio
|
|
*/
|
|
gdouble zathura_adjustment_get_ratio(GtkAdjustment* adjustment);
|
|
|
|
/**
|
|
* Set the adjustment value from ratio
|
|
*
|
|
* The ratio is usually obtained from a previous call to
|
|
* zathura_adjustment_get_ratio().
|
|
*
|
|
* @param adjustment Adjustment instance
|
|
* @param ratio Ratio from which the adjustment value will be set
|
|
*/
|
|
void zathura_adjustment_set_value_from_ratio(GtkAdjustment* adjustment,
|
|
gdouble ratio);
|
|
|
|
#endif /* ZATHURA_ADJUSTMENT_H */
|