cosmetic updates in engine list functions, trade menu updates

1 files changed, 47 insertions, 15 deletions

diff --git a/src/ui/scrollpane.cc b/src/ui/scrollpane.cc
index 38260e0..48391c5 100644
--- a/src/ui/scrollpane.cc
+++ b/src/ui/scrollpane.cc
@@ -18,6 +18,7 @@ ScrollPane::ScrollPane(Widget *parent, ui::Text &text) : Widget(parent), scrollp
 	set_label("scrollpane");
 	set_alignment(AlignBottom);
 	scrollpane_scroll = 0;
+	scrollpane_offset = 1;
 }
 
 ScrollPane::~ScrollPane()
@@ -29,7 +30,7 @@ void ScrollPane::set_alignment(const unsigned int alignment)
 	scrollpane_alignment = alignment;
 }
 
-void ScrollPane::set_scroll(int scroll)
+void ScrollPane::set_scroll(const int scroll)
 {
 	scrollpane_scroll = scroll;
 
@@ -39,22 +40,52 @@ void ScrollPane::set_scroll(int scroll)
 		scrollpane_scroll = 0;
 }
 
-void ScrollPane::inc_scroll(int scroll)
+void ScrollPane::inc_scroll(const int scroll)
 {
 	scrollpane_scroll += scroll;
 
 	if (scrollpane_scroll > (int) scrollpane_text.size())
 		scrollpane_scroll = (int) scrollpane_text.size();
+	else if (scrollpane_scroll < 0)
+		scrollpane_scroll = 0;
 }
 
-void ScrollPane::dec_scroll(int scroll)
+void ScrollPane::dec_scroll(const int scroll)
 {
 	scrollpane_scroll -= scroll;
 
-	if (scrollpane_scroll < 0)
+	if (scrollpane_scroll > (int) scrollpane_text.size())
+		scrollpane_scroll = (int) scrollpane_text.size();
+	else if (scrollpane_scroll < 0)
 		scrollpane_scroll = 0;
 }
 
+void ScrollPane::set_offset(const int offset)
+{
+	scrollpane_offset = offset;
+}
+
+bool ScrollPane::on_keypress(const int key, const unsigned int modifier)
+{
+	// number of lines to scroll
+	int alignmentmodifier =( (alignment() & AlignTop) == AlignTop) ? -1 : 1;
+	
+	switch (key) {
+		
+		case 512 + SDL_BUTTON_WHEELUP:
+			inc_scroll(alignmentmodifier * scrollpane_offset);
+			return true;
+			break;
+		
+		case 512 + SDL_BUTTON_WHEELDOWN:
+			dec_scroll(alignmentmodifier * scrollpane_offset);
+			return true;
+			break;
+	}
+
+	return false;
+}
+
 void ScrollPane::draw()
 {
 	render::Text::setfont(font()->name().c_str(), font()->width(), font()->height());
@@ -69,12 +100,17 @@ void ScrollPane::draw()
 		scrollpane_scroll = (int) scrollpane_text.size();
 	else if (scrollpane_scroll < 0)
 		scrollpane_scroll = 0;
-
-	int bottom = (int) scrollpane_text.size() - scrollpane_scroll;
+	
+	int bottom = 0;
 	int current_line = 0;
-
+	
+	if ((alignment() & AlignTop) == AlignTop) {
+		bottom = text_height + (int) scrollpane_scroll;
+	} else {
+		bottom = (int) scrollpane_text.size() - scrollpane_scroll;
+	}
+	
 	ui::Text lines;
-
 	for (ui::Text::const_iterator it = scrollpane_text.begin(); it != scrollpane_text.end() && current_line < bottom; it++) {
 		if (current_line >= bottom - text_height) {
 			std::string linedata(*it);
@@ -169,13 +205,9 @@ void ScrollPane::draw()
 	float y = 0;
 
 	if ((alignment() & AlignTop) == AlignTop) {
-		int i = (int) lines.size();
-		for (ui::Text::iterator it = lines.begin(); it != lines.end(); it++) {
-			if (i <= text_height) {
-				render::Text::draw(gl.x(), gl.y() + y, (*it));
-				y += font()->height();
-			}
-			i--;
+		for (ui::Text::iterator it = lines.begin(); (y + font()->height() < height()) && (it != lines.end()); it++) {
+			render::Text::draw(gl.x(), gl.y() + y, (*it));
+			y += font()->height();
 		}
 	} else {
 		y = height() - font()->height();