From 5db33d11bd569f4040fd58e4f39cf97ed94fec29 Mon Sep 17 00:00:00 2001
From: Campbell Barton <ideasman42@gmail.com>
Date: Sun, 18 Sep 2011 01:34:53 +0000
Subject: [PATCH] Console Scrolling - reset while typing. patch from Damir
 Prebeg with some edits.

Also made it so resizing the console view keeps the lower part of the text in view (could be annoying when you needed to scroll because of a resized view).
---
 .../editors/space_console/console_ops.c       | 30 +++++++++++++++++--
 .../editors/space_console/space_console.c     |  9 ++++++
 2 files changed, 36 insertions(+), 3 deletions(-)

diff --git a/source/blender/editors/space_console/console_ops.c b/source/blender/editors/space_console/console_ops.c
index 85cf30dfeba..51e2679e8c2 100644
--- a/source/blender/editors/space_console/console_ops.c
+++ b/source/blender/editors/space_console/console_ops.c
@@ -54,6 +54,14 @@
 
 #include "console_intern.h"
 
+/* so when we type - the view scrolls to the bottom */
+static void console_scroll_bottom(ARegion *ar)
+{
+	View2D *v2d= &ar->v2d;
+	v2d->cur.ymin = 0.0;
+	v2d->cur.ymax =(float)v2d->winy;
+}
+
 static void console_textview_update_rect(SpaceConsole *sc, ARegion *ar)
 {
 	View2D *v2d= &ar->v2d;
@@ -339,9 +347,14 @@ static int move_exec(bContext *C, wmOperator *op)
 	}
 	
 	if(done) {
-		ED_area_tag_redraw(CTX_wm_area(C));
+		ScrArea *sa= CTX_wm_area(C);
+		ARegion *ar= CTX_wm_region(C);
+
+		ED_area_tag_redraw(sa);
+		console_scroll_bottom(ar);
 	}
-	
+
+
 	return OPERATOR_FINISHED;
 }
 
@@ -391,7 +404,9 @@ static int insert_exec(bContext *C, wmOperator *op)
 
 	console_textview_update_rect(sc, ar);
 	ED_area_tag_redraw(CTX_wm_area(C));
-	
+
+	console_scroll_bottom(ar);
+
 	return OPERATOR_FINISHED;
 }
 
@@ -478,6 +493,8 @@ static int delete_exec(bContext *C, wmOperator *op)
 
 	console_textview_update_rect(sc, ar);
 	ED_area_tag_redraw(CTX_wm_area(C));
+
+	console_scroll_bottom(ar);
 	
 	return OPERATOR_FINISHED;
 }
@@ -589,6 +606,8 @@ static int history_cycle_exec(bContext *C, wmOperator *op)
 	console_textview_update_rect(sc, ar);
 	ED_area_tag_redraw(CTX_wm_area(C));
 
+	console_scroll_bottom(ar);
+
 	return OPERATOR_FINISHED;
 }
 
@@ -612,6 +631,7 @@ void CONSOLE_OT_history_cycle(wmOperatorType *ot)
 static int history_append_exec(bContext *C, wmOperator *op)
 {
 	SpaceConsole *sc= CTX_wm_space_console(C);
+	ARegion *ar= CTX_wm_region(C);
 	ScrArea *sa= CTX_wm_area(C);
 	ConsoleLine *ci= console_history_verify(C);
 	char *str= RNA_string_get_alloc(op->ptr, "text", NULL, 0); /* own this text in the new line, dont free */
@@ -637,6 +657,8 @@ static int history_append_exec(bContext *C, wmOperator *op)
 
 	ED_area_tag_redraw(sa);
 
+	console_scroll_bottom(ar);
+
 	return OPERATOR_FINISHED;
 }
 
@@ -825,6 +847,8 @@ static int paste_exec(bContext *C, wmOperator *UNUSED(op))
 	console_textview_update_rect(sc, ar);
 	ED_area_tag_redraw(CTX_wm_area(C));
 
+	console_scroll_bottom(ar);
+
 	return OPERATOR_FINISHED;
 }
 
diff --git a/source/blender/editors/space_console/space_console.c b/source/blender/editors/space_console/space_console.c
index c8fa049f5eb..5a965fc076b 100644
--- a/source/blender/editors/space_console/space_console.c
+++ b/source/blender/editors/space_console/space_console.c
@@ -138,8 +138,17 @@ static void console_main_area_init(wmWindowManager *wm, ARegion *ar)
 	wmKeyMap *keymap;
 	ListBase *lb;
 
+	const int prev_y_min= ar->v2d.cur.ymin; /* so resizing keeps the cursor visible */
+
 	UI_view2d_region_reinit(&ar->v2d, V2D_COMMONVIEW_CUSTOM, ar->winx, ar->winy);
 
+	/* always keep the bottom part of the view aligned, less annoying */
+	if(prev_y_min != ar->v2d.cur.ymin) {
+		const float cur_y_range= ar->v2d.cur.ymax - ar->v2d.cur.ymin;
+		ar->v2d.cur.ymin= prev_y_min;
+		ar->v2d.cur.ymax= prev_y_min + cur_y_range;
+	}
+
 	/* own keymap */
 	keymap= WM_keymap_find(wm->defaultconf, "Console", SPACE_CONSOLE, 0);
 	WM_event_add_keymap_handler_bb(&ar->handlers, keymap, &ar->v2d.mask, &ar->winrct);