Preserve scroll position across reflows
Finally! Changing the message visibility threshold doesn't totally screw up scroll position. Neither do horizontal resizes, but vertical resizes drift because the value of windowTop() changes before and after... The scroll position is anchored to the top of the window. It's arbitrary whether to anchor the top or the bottom, but other scrolling commands like M-p and C-r are anchored to the top, so this is consistent.master
parent
52c58128c8
commit
d7d4572220
20
ui.c
20
ui.c
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@ -567,10 +567,25 @@ void uiFormat(
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uiWrite(id, heat, time, buf);
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}
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static void scrollTo(struct Window *window, int top) {
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window->scroll = 0;
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windowScroll(window, top - MAIN_LINES + MarkerLines);
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}
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static void windowReflow(struct Window *window) {
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uint num = 0;
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const struct Line *line = bufferHard(window->buffer, windowTop(window));
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if (line) num = line->num;
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window->unreadHard = bufferReflow(
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window->buffer, COLS, window->thresh, window->unreadSoft
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);
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if (!window->scroll || !num) return;
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for (size_t i = 0; i < BufferCap; ++i) {
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line = bufferHard(window->buffer, i);
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if (!line || line->num != num) continue;
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scrollTo(window, BufferCap - i);
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break;
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}
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}
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static void resize(void) {
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@ -762,11 +777,6 @@ static void scrollPage(struct Window *window, int n) {
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windowScroll(window, n * (MAIN_LINES - SplitLines - MarkerLines - 1));
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}
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static void scrollTo(struct Window *window, int top) {
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window->scroll = 0;
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windowScroll(window, top - MAIN_LINES + MarkerLines);
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}
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static void scrollHot(struct Window *window, int dir) {
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for (size_t i = windowTop(window) + dir; i < BufferCap; i += dir) {
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const struct Line *line = bufferHard(window->buffer, i);
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