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c9eef95492
Instead of guesstimating the values of the scrollbars adjustments after a change in zoom level, connect callbacks to the "changed" GtkAdjustment event (which is emitted when the bounds or page_size of the adjustment change, e.g. when the zoom level changes), and compute the new values from there. The previous adjustment values are tracked in zathura->ui.hadjustment and zathura->ui.vadjustment (and updated by signal handlers as well), so that the view's position can be maintained while zooming. cb_view_hadjustment_changed() centers the page horizontally if a "best-fit" or "width" zoom is being performed, or if "zoom-center" is true; otherwise, it keeps the view horizontally centered around the same area of the page. cb_view_vadjustment_changed() always keeps the view vertically centered around the same area of the page. Many thanks to Marwan Tanager for thoroughly reviewing the various stages of this patch, and actually coming up with a working solution. Signed-off-by: Sebastian Ramacher <sebastian+dev@ramacher.at>
206 lines
6.3 KiB
C
206 lines
6.3 KiB
C
/* See LICENSE file for license and copyright information */
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#ifndef CALLBACKS_H
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#define CALLBACKS_H
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#include <gtk/gtk.h>
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#include <girara/types.h>
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#include <girara/macros.h>
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#include "internal.h"
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#include "document.h"
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#include "zathura.h"
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/**
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* Quits the current zathura session
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*
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* @param widget The gtk window of zathura
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* @param zathura Correspondending zathura session
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* @return true if no error occured and the event has been handled
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*/
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gboolean cb_destroy(GtkWidget* widget, zathura_t* zathura);
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/**
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* This function gets called when the buffer of girara changes
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*
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* @param session The girara session
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*/
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void cb_buffer_changed(girara_session_t* session);
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/**
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* This function gets called when the value of the vertical scrollbars
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* changes (e.g.: by scrolling, moving to another page)
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*
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* @param adjustment The vadjustment of the page view
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* @param data NULL
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*/
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void cb_view_vadjustment_value_changed(GtkAdjustment *adjustment, gpointer data);
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/**
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* This function gets called when the bounds or the page_size of the horizontal
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* scrollbar change (e.g. when the zoom level is changed).
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*
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* It adjusts the value of the horizontal scrollbar, possibly based on its
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* previous adjustment, stored in the tracking adjustment
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* zathura->ui.hadjustment.
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*
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* @param adjustment The horizontal adjustment of a gtkScrolledWindow
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* @param data The zathura instance
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*/
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void cb_view_hadjustment_changed(GtkAdjustment *adjustment, gpointer data);
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/**
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* This function gets called when the bounds or the page_size of the vertical
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* scrollbar change (e.g. when the zoom level is changed).
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*
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* It adjusts the value of the vertical scrollbar based on its previous
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* adjustment, stored in the tracking adjustment zathura->ui.hadjustment.
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*
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* @param adjustment The vertical adjustment of a gtkScrolledWindow
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* @param data The zathura instance
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*/
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void cb_view_vadjustment_changed(GtkAdjustment *adjustment, gpointer data);
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/* This function gets called when the value of the adjustment changes.
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*
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* It updates the value of the tracking adjustment, only if the bounds of the
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* adjustment have not changed (if they did change,
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* cb_adjustment_track_bounds() will take care of updating everything).
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*
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* @param adjustment The adjustment instance
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* @param data The tracking adjustment instance
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*/
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void cb_adjustment_track_value(GtkAdjustment* adjustment, gpointer data);
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/* This function gets called when the bounds or the page_size of the adjustment
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* change.
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*
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* It updates the value, bounds and page_size of the tracking adjustment.
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*
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* @param adjustment The adjustment instance
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* @param data The tracking adjustment instance
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*/
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void cb_adjustment_track_bounds(GtkAdjustment* adjustment, gpointer data);
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/**
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* This function gets called when the value of the "pages-per-row"
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* variable changes
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*
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* @param session The current girara session
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* @param name The name of the row
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* @param type The settings type
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* @param value The value
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* @param data Custom data
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*/
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void cb_pages_per_row_value_changed(girara_session_t* session, const char* name,
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girara_setting_type_t type, void* value, void* data);
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/**
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* This function gets called when the value of the "first-page-column"
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* variable changes
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*
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* @param session The current girara session
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* @param name The name of the row
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* @param type The settings type
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* @param value The value
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* @param data Custom data
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*/
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void cb_first_page_column_value_changed(girara_session_t* session, const char* name,
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girara_setting_type_t type, void* value, void* data);
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/**
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* Called when an index element is activated (e.g.: double click)
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*
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* @param tree_view Tree view
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* @param path Path
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* @param column Column
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* @param zathura Zathura session
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*/
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void cb_index_row_activated(GtkTreeView* tree_view, GtkTreePath* path,
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GtkTreeViewColumn* column, void* zathura);
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/**
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* Called when input has been passed to the sc_follow dialog
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*
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* @param entry The dialog inputbar
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* @param session The girara session
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* @return true if no error occured and the event has been handled
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*/
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bool cb_sc_follow(GtkEntry* entry, girara_session_t* session);
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/**
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* Called when input has been passed to the sc_display_link dialog
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*
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* @param entry The dialog inputbar
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* @param session The girara session
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* @return true if no error occured and the event has been handled
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*/
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bool cb_sc_display_link(GtkEntry* entry, girara_session_t* session);
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/**
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* Emitted when file has been changed
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*
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* @param monitor The file monitor
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* @param file The file
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* @param other_file A file or NULL
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* @param event The monitor event
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* @param session The girara session
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*/
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void cb_file_monitor(GFileMonitor* monitor, GFile* file, GFile* other_file,
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GFileMonitorEvent event, girara_session_t* session);
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/**
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* Callback to read new password for file that should be opened
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*
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* @param entry The password entry
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* @param dialog The dialog information
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* @return true if input has been handled
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*/
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bool cb_password_dialog(GtkEntry* entry, zathura_password_dialog_info_t* dialog);
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/**
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* Emitted when the view has been resized
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*
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* @param widget View
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* @param allocation Allocation
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* @param zathura Zathura session
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* @return true if signal has been handled successfully
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*/
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bool cb_view_resized(GtkWidget* widget, GtkAllocation* allocation, zathura_t* zathura);
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/**
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* Emitted when the 'recolor' setting is changed
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*
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* @param session Girara session
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* @param name Name of the setting ("recolor")
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* @param type Type of the setting (BOOLEAN)
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* @param value New value
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* @param data Custom data
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*/
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void cb_setting_recolor_change(girara_session_t* session, const char* name,
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girara_setting_type_t type, void* value, void* data);
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/**
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* Emitted when the 'recolor-keephue' setting is changed
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*
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* @param session Girara session
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* @param name Name of the setting ("recolor")
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* @param type Type of the setting (BOOLEAN)
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* @param value New value
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* @param data Custom data
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*/
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void cb_setting_recolor_keep_hue_change(girara_session_t* session, const char* name,
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girara_setting_type_t type, void* value, void* data);
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/**
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* Unknown command handler which is used to handle the strict numeric goto
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* command
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*
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* @param session The girara session
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* @param input The command input
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* @return true if the input has been handled
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*/
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bool cb_unknown_command(girara_session_t* session, const char* input);
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#endif // CALLBACKS_H
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