From 64c405c541eef1f17d848b1538a7175134d4c14c Mon Sep 17 00:00:00 2001
From: Michael Drake <tlsa@netsurf-browser.org>
Date: Tue, 29 Nov 2011 14:20:25 +0000
Subject: New function for sending a scroll request into a core browser window
 at a given coordinate.  Currently handles frames only.  TODO: iframes and css
 overflow scrollable boxes.  Front ends should call this to pass scroll wheel
 actions to the core.

svn path=/trunk/netsurf/; revision=13197
---
 desktop/browser.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 desktop/browser.h | 15 +++++++++++++++
 2 files changed, 61 insertions(+)

diff --git a/desktop/browser.c b/desktop/browser.c
index 760849f6a..124821ff2 100644
--- a/desktop/browser.c
+++ b/desktop/browser.c
@@ -526,6 +526,52 @@ void browser_window_get_contextual_content(struct browser_window *bw,
 	browser_window__get_contextual_content(bw, x, y, data);
 }
 
+/* exported interface, documented in browser.h */
+bool browser_window_scroll_at_point(struct browser_window *bw,
+		int x, int y, int scrx, int scry)
+{
+	bool handled_scroll = false;
+	assert(bw != NULL);
+
+	if (bw->children) {
+		/* Browser window has children, so pass request on to
+		 * appropriate child */
+		struct browser_window *bwc;
+		int cur_child;
+		int children = bw->rows * bw->cols;
+
+		/* Loop through all children of bw */
+		for (cur_child = 0; cur_child < children; cur_child++) {
+			/* Set current child */
+			bwc = &bw->children[cur_child];
+
+			/* Skip this frame if (x, y) coord lies outside */
+			if (x < bwc->x || bwc->x + bwc->width < x ||
+					y < bwc->y || bwc->y + bwc->height < y)
+				continue;
+
+			/* Pass request into this child */
+			return browser_window_scroll_at_point(bwc,
+					(x - bwc->x), (y - bwc->y),
+					scrx, scry);
+		}
+	}
+
+	/* TODO:
+	 * Pass scroll to content to try scrolling something at this point */
+
+	/* Try to scroll this window, if scroll not already handled */
+	if (handled_scroll == false) {
+		if (bw->scroll_y && scrollbar_scroll(bw->scroll_y, scry))
+			handled_scroll = true;
+
+		if (bw->scroll_x && scrollbar_scroll(bw->scroll_x, scrx))
+			handled_scroll = true;
+	}
+
+	return handled_scroll;
+}
+
 
 /**
  * Create and open a new root browser window with the given page.
diff --git a/desktop/browser.h b/desktop/browser.h
index d5c7079af..f2298b59f 100644
--- a/desktop/browser.h
+++ b/desktop/browser.h
@@ -249,6 +249,21 @@ void browser_window_set_scale(struct browser_window *bw, float scale, bool all);
 void browser_window_get_contextual_content(struct browser_window *bw,
 		int x, int y, struct contextual_content *data);
 
+/**
+ * Send a scroll request to a browser window at a particular point.  The
+ * 'deepest' scrollable object which can be scrolled in the requested
+ * direction at the given point will consume the scroll.
+ *
+ * \param bw	browser window to look inside
+ * \param x	x-coordinate of point of interest
+ * \param y	y-coordinate of point of interest
+ * \param scrx	number of px try to scroll something in x direction
+ * \param scry	number of px try to scroll something in y direction
+ * \return true iff scroll request has been consumed
+ */
+bool browser_window_scroll_at_point(struct browser_window *bw,
+		int x, int y, int scrx, int scry);
+
 void browser_window_refresh_url_bar(struct browser_window *bw, nsurl *url,
 		lwc_string *frag);
 
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