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Comments about arithmetic in scrolling.

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(cherry picked from commit 4871ad0643)
This commit is contained in:
Kalle Olavi Niemitalo 2007-11-25 22:20:18 +02:00 committed by Kalle Olavi Niemitalo
parent 04387d8d6c
commit a307371d9e
1 changed files with 44 additions and 0 deletions
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44
src/viewer/text/view.c
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@ -634,8 +634,19 @@ move_link_up_line(struct session *ses, struct document_view *doc_view)
if (link->points[0].y != y) continue; if (link->points[0].y != y) continue;
if (y < vs->y) { if (y < vs->y) {
/* The line is above the visible part
* of the document. Scroll it by one
* page, but not at all past the
* beginning of the document. */
int mini = int_min(box->height, vs->y); int mini = int_min(box->height, vs->y);
/* Before this update, y is the line
* number in the document, and y - y1
* is the number of lines the cursor
* must move in the document.
* Afterwards, y does not make sense,
* but y - y1 is the number of lines
* the cursor must move on the screen. */
vs->y -= mini; vs->y -= mini;
y += mini; y += mini;
} }
@ -686,8 +697,19 @@ move_link_down_line(struct session *ses, struct document_view *doc_view)
if (link->points[0].y != y) continue; if (link->points[0].y != y) continue;
if (y >= vs->y + box->height) { if (y >= vs->y + box->height) {
/* The line is below the visible part
* of the document. Scroll it by one
* page, but keep at least one line of
* the document on the screen. */
int mini = int_min(box->height, document->height - vs->y - 1); int mini = int_min(box->height, document->height - vs->y - 1);
/* Before this update, y is the line
* number in the document, and y - y1
* is the number of lines the cursor
* must move in the document.
* Afterwards, y does not make sense,
* but y - y1 is the number of lines
* the cursor must move on the screen. */
vs->y += mini; vs->y += mini;
y -= mini; y -= mini;
} }
@ -754,8 +776,19 @@ move_link_prev_line(struct session *ses, struct document_view *doc_view)
y = last->points[0].y; y = last->points[0].y;
if (y < vs->y) { if (y < vs->y) {
/* The line is above the visible part
* of the document. Scroll it by one
* page, but not at all past the
* beginning of the document. */
int mini = int_min(box->height, vs->y); int mini = int_min(box->height, vs->y);
/* Before this update, y is the line
* number in the document, and y - y1
* is the number of lines the cursor
* must move in the document.
* Afterwards, y does not make sense,
* but y - y1 is the number of lines
* the cursor must move on the screen. */
vs->y -= mini; vs->y -= mini;
y += mini; y += mini;
} }
@ -822,8 +855,19 @@ move_link_next_line(struct session *ses, struct document_view *doc_view)
y = last->points[0].y; y = last->points[0].y;
if (y >= vs->y + box->height) { if (y >= vs->y + box->height) {
/* The line is below the visible part
* of the document. Scroll it by one
* page, but keep at least one line of
* the document on the screen. */
int mini = int_min(box->height, document->height - vs->y - 1); int mini = int_min(box->height, document->height - vs->y - 1);
/* Before this update, y is the line
* number in the document, and y - y1
* is the number of lines the cursor
* must move in the document.
* Afterwards, y does not make sense,
* but y - y1 is the number of lines
* the cursor must move on the screen. */
vs->y += mini; vs->y += mini;
y -= mini; y -= mini;
} }