basic choices view

driver/ui/view_selection.cpp

@@ -0,0 +1,72 @@
+#include "view_selection.h"
+
+void ViewSelection::draw()
+{
+	
+	for(size_t i = 0; i < choices.size(); i++)
+	{
+		if(selection == i)
+			wattron(win, A_REVERSE);
+		mvwprintw(win, i + choice_offset_y, choice_offset_x, "%s", choices[i].c_str());
+		if(selection == i)
+			wattroff(win, A_REVERSE);		
+	}
+}
+
+void ViewSelection::addChoice(std::string name, std::function<void(int)> call)
+{
+	choices.push_back(name);
+	calls.push_back(call);
+}
+
+std::function<void(int)> ViewSelection::keypress(int& key)
+{
+	std::function<void(int)> ret = nullptr;
+	switch(key)
+	{
+		case KEY_UP:
+			do
+				selection = (selection - 1 + choices.size()) % choices.size();
+			while(!choices[selection].length() && choices.size());
+			break;
+		case KEY_DOWN:
+			do
+				selection = (selection + 1) % choices.size();
+			while(!choices[selection].length() && choices.size());
+			break;
+		case KEY_MOUSE:
+		{
+			// http://pronix.linuxdelta.de/C/Linuxprogrammierung/Linuxsystemprogrammieren_C_Kurs_Kapitel10b.shtml
+			MEVENT event;
+			bool hit = false;
+			if(getmouse(&event) == OK && event.bstate & (BUTTON1_CLICKED | BUTTON1_DOUBLE_CLICKED))
+			{
+				size_t column_start = start_x + choice_offset_x;
+				size_t row_start = start_y + choice_offset_y;
+				size_t mouse_x = event.x, mouse_y = event.y;
+				for(size_t i = 0; i < choices.size(); i++)
+					if(choices[i].length() && mouse_y == row_start + i && mouse_x >= column_start && mouse_x < column_start + choices[i].length())
+					{
+						if(selection == i || event.bstate & BUTTON1_DOUBLE_CLICKED)
+							hit = true;
+						selection = i;
+					}
+			}
+			if(!hit)
+				break;
+			
+			// fall through to next case
+			__attribute__ ((fallthrough));
+		}
+		case KEY_ENT:
+			if(selection == choices.size() - 1) // exit
+				key = -1; // do return from view
+			else
+				ret = calls[selection];			
+			break;
+		default:
+			break;
+	}
+	repaint();
+	return ret;
+}