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Account for scrollbars when fitting page into window

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The width of the vertical scrollbar (if there is one) needs to be
substracted from the width of the GtkScrolledWindow in order to obtain
the correct dimensions of the view area.

See issue 27 <http://bugs.pwmt.org/issue27>.

It also deals better with documents where pages don't all have the same
size.

Reported-by: Andreas Weinlich <business@weinlich.org>

Signed-off-by: Sebastian Ramacher <sebastian+dev@ramacher.at>
This commit is contained in:
Benoît Knecht 2012-12-13 12:43:50 +01:00 • committed by Sebastian Ramacher
parent 99fbf0d17b
commit 92c26ed28d
1 changed files with 46 additions and 59 deletions
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105
shortcuts.c
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@ -98,6 +98,9 @@ sc_adjust_window(girara_session_t* session, girara_argument_t* argument,
unsigned int first_page_column = 1;
girara_setting_get(session, "first-page-column", &first_page_column);
int padding = 1;
girara_setting_get(zathura->ui.session, "page-padding", &padding);
if (zathura->ui.page_widget == NULL || zathura->document == NULL) {
goto error_ret;
}
@ -112,8 +115,8 @@ sc_adjust_window(girara_session_t* session, girara_argument_t* argument,
/* get window size */
GtkAllocation allocation;
gtk_widget_get_allocation(session->gtk.view, &allocation);
double width = allocation.width;
double height = allocation.height;
unsigned int width = allocation.width;
unsigned int height = allocation.height;
/* scrollbar spacing */
gint spacing;
@ -126,71 +129,55 @@ sc_adjust_window(girara_session_t* session, girara_argument_t* argument,
height += allocation.height;
}
/* calculate total width and max-height */
double total_width = 0;
double total_height = 0;
double max_height = 0;
double max_width = 0;
double scale = 1.0;
unsigned int cell_height = 0, cell_width = 0;
unsigned int document_height = 0, document_width = 0;
unsigned int number_of_pages = zathura_document_get_number_of_pages(zathura->document);
for (unsigned int page_id = 0; page_id < pages_per_row; page_id++) {
if (page_id == number_of_pages) {
break;
}
zathura_document_set_scale(zathura->document, scale);
zathura_document_get_cell_size(zathura->document, &cell_height, &cell_width);
zathura_get_document_size(zathura, cell_height, cell_width,
&document_height, &document_width);
zathura_page_t* page = zathura_document_get_page(zathura->document, page_id);
if (page == NULL) {
goto error_ret;
}
double page_ratio = (double)cell_height / (double)document_width;
double window_ratio = (double)height / (double)width;
unsigned int page_height = zathura_page_get_height(page);
unsigned int page_width = zathura_page_get_width(page);
if (argument->n == ZATHURA_ADJUST_WIDTH ||
(argument->n == ZATHURA_ADJUST_BESTFIT && page_ratio < window_ratio)) {
scale = (double)(width - (pages_per_row - 1) * padding) /
(double)(pages_per_row * cell_width);
zathura_document_set_scale(zathura->document, scale);
if (page_height > max_height) {
max_height = page_height;
}
bool show_scrollbars = false;
girara_setting_get(session, "show-scrollbars", &show_scrollbars);
if (page_width > max_width) {
max_width = page_width;
}
if (show_scrollbars) {
/* If the document is taller than the view, there's a vertical
* scrollbar; we need to substract its width from the view's width. */
zathura_get_document_size(zathura, cell_height, cell_width,
&document_height, &document_width);
if (height < document_height) {
GtkWidget* vscrollbar = gtk_scrolled_window_get_vscrollbar(
GTK_SCROLLED_WINDOW(session->gtk.view));
total_width += page_width;
total_height += page_height;
}
unsigned int rotation = zathura_document_get_rotation(zathura->document);
double page_ratio = max_height / total_width;
double window_ratio = height / width;
if (rotation == 90 || rotation == 270) {
page_ratio = max_width / total_height;
}
switch (argument->n) {
case ZATHURA_ADJUST_WIDTH:
if (rotation == 0 || rotation == 180) {
zathura_document_set_scale(zathura->document, width / total_width);
} else {
zathura_document_set_scale(zathura->document, width / total_height);
}
break;
case ZATHURA_ADJUST_BESTFIT:
if (rotation == 0 || rotation == 180) {
if (page_ratio < window_ratio) {
zathura_document_set_scale(zathura->document, width / total_width);
} else {
zathura_document_set_scale(zathura->document, height / max_height);
}
} else {
if (page_ratio < window_ratio) {
zathura_document_set_scale(zathura->document, width / total_height);
} else {
zathura_document_set_scale(zathura->document, height / max_width);
if (vscrollbar != NULL) {
GtkRequisition requisition;
gtk_widget_get_requisition(vscrollbar, &requisition);
if (0 < requisition.width && (unsigned)requisition.width < width) {
width -= requisition.width;
scale = (double)(width - (pages_per_row - 1) * padding) /
(double)(pages_per_row * cell_width);
zathura_document_set_scale(zathura->document, scale);
}
}
}
break;
default:
goto error_ret;
}
}
else if (argument->n == ZATHURA_ADJUST_BESTFIT) {
scale = (double)height / (double)cell_height;
zathura_document_set_scale(zathura->document, scale);
}
else {
goto error_ret;
}
/* keep position */