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tAdd scrollbar dragging - ledit - Text editor (WIP) |
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git clone git://lumidify.org/ledit.git (fast, but not encrypted) |
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git clone https://lumidify.org/git/ledit.git (encrypted, but very slow) |
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Log |
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Files |
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Refs |
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README |
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LICENSE |
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--- |
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commit 1e24e8b24d8dd6676dab036a858e5404c2dfdb10 |
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parent 78088f20cdb93ead1b980f3a4092ce0a1227aafa |
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Author: lumidify <[email protected]> |
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Date: Thu, 1 Apr 2021 20:12:19 +0200 |
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Add scrollbar dragging |
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Diffstat: |
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M ledit.c | 48 ++++++++++++++++++++++++++++-… |
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1 file changed, 44 insertions(+), 4 deletions(-) |
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--- |
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diff --git a/ledit.c b/ledit.c |
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t@@ -93,7 +93,7 @@ static int cur_subline = 0; |
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static int cur_index = 0; |
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static int trailing = 0; |
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static int total_height = 0; |
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-static int cur_display_offset = 0; |
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+static double cur_display_offset = 0; |
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static void |
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init_line(struct line *l) { |
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t@@ -189,6 +189,24 @@ static void change_keyboard(char *lang); |
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PangoAttrList *basic_attrs; |
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static void |
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+get_scroll_pos_height(double *pos, double *height) { |
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+ *height = ((double)state.h / total_height) * state.h; |
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+ *pos = (cur_display_offset / (total_height - state.h)) * (state.h - *h… |
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+} |
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+ |
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+static void |
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+set_scroll_pos(double pos) { |
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+ cur_display_offset = pos * (total_height / (double)state.h); |
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+ if (cur_display_offset < 0) |
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+ cur_display_offset = 0; |
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+ if (cur_display_offset + state.h > total_height) |
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+ cur_display_offset = total_height - state.h; |
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+} |
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+ |
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+static int scroll_dragging = 0; |
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+static int scroll_grab_handle = 0; |
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+ |
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+static void |
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mainloop(void) { |
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XEvent event; |
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int xkb_event_type; |
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t@@ -255,6 +273,18 @@ mainloop(void) { |
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switch (event.xbutton.button) { |
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case Button1: |
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button_press(event); |
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+ double scroll_h, scroll_y; |
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+ get_scroll_pos_height(&scroll_… |
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+ int x = event.xbutton.x; |
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+ int y = event.xbutton.y; |
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+ if (x >= state.w - 10) { |
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+ scroll_dragging = 1; |
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+ scroll_grab_handle = y; |
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+ if (y < scroll_y || y … |
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+ double new_scr… |
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+ set_scroll_pos… |
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+ } |
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+ } |
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break; |
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case Button4: |
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cur_display_offset -= 10; |
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t@@ -272,11 +302,21 @@ mainloop(void) { |
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need_redraw = 1; |
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break; |
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case ButtonRelease: |
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- if (event.xbutton.button == Button1) |
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+ if (event.xbutton.button == Button1) { |
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button_release(); |
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+ scroll_dragging = 0; |
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+ } |
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break; |
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case MotionNotify: |
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drag_motion(event); |
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+ if (scroll_dragging) { |
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+ double scroll_h, scroll_y; |
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+ get_scroll_pos_height(&scroll_y, &scro… |
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+ scroll_y += event.xbutton.y - scroll_g… |
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+ scroll_grab_handle = event.xbutton.y; |
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+ set_scroll_pos(scroll_y); |
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+ } |
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+ need_redraw = 1; |
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break; |
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case KeyPress: |
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need_redraw = 1; |
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t@@ -374,8 +414,8 @@ mainloop(void) { |
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} |
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} |
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if (total_height > state.h) { |
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- double scroll_h = ((double)state.h / total_hei… |
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- double scroll_y = ((double)cur_display_offset … |
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+ double scroll_h, scroll_y; |
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+ get_scroll_pos_height(&scroll_y, &scroll_h); |
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XFillRectangle(state.dpy, state.back_buf, stat… |
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} |
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