Scrollwheel (w/o ctrl) to zoom, mouse warping when panning

Now uses Ctrl + Scrollwheel for vertical scrolling
Ctrl + Shift Scrollwheel for horizontal scrolling
Also converts some macros to constants

scene/gui/graph_edit.cpp

@@ -40,8 +40,8 @@
 #include "editor/editor_scale.h"
 #endif
 
-#define MINIMAP_OFFSET 12
-#define MINIMAP_PADDING 5
+constexpr int MINIMAP_OFFSET = 12;
+constexpr int MINIMAP_PADDING = 5;
 
 bool GraphEditFilter::has_point(const Point2 &p_point) const {
 	return ge->_filter_input(p_point);
@@ -1067,8 +1067,9 @@ void GraphEdit::_gui_input(const Ref<InputEvent> &p_ev) {
 
 	Ref<InputEventMouseMotion> mm = p_ev;
 	if (mm.is_valid() && (mm->get_button_mask() & MOUSE_BUTTON_MASK_MIDDLE || (mm->get_button_mask() & MOUSE_BUTTON_MASK_LEFT && Input::get_singleton()->is_key_pressed(KEY_SPACE)))) {
-		h_scroll->set_value(h_scroll->get_value() - mm->get_relative().x);
-		v_scroll->set_value(v_scroll->get_value() - mm->get_relative().y);
+		Vector2i relative = Input::get_singleton()->warp_mouse_motion(mm, get_global_rect());
+		h_scroll->set_value(h_scroll->get_value() - relative.x);
+		v_scroll->set_value(v_scroll->get_value() - relative.y);
 	}
 
 	if (mm.is_valid() && dragging) {
@@ -1317,18 +1318,20 @@ void GraphEdit::_gui_input(const Ref<InputEvent> &p_ev) {
 			minimap->update();
 		}
 
-		if (b->get_button_index() == MOUSE_BUTTON_WHEEL_UP && Input::get_singleton()->is_key_pressed(KEY_CTRL)) {
-			set_zoom_custom(zoom * zoom_step, b->get_position());
-		} else if (b->get_button_index() == MOUSE_BUTTON_WHEEL_DOWN && Input::get_singleton()->is_key_pressed(KEY_CTRL)) {
-			set_zoom_custom(zoom / zoom_step, b->get_position());
-		} else if (b->get_button_index() == MOUSE_BUTTON_WHEEL_UP && !Input::get_singleton()->is_key_pressed(KEY_SHIFT)) {
-			v_scroll->set_value(v_scroll->get_value() - v_scroll->get_page() * b->get_factor() / 8);
-		} else if (b->get_button_index() == MOUSE_BUTTON_WHEEL_DOWN && !Input::get_singleton()->is_key_pressed(KEY_SHIFT)) {
-			v_scroll->set_value(v_scroll->get_value() + v_scroll->get_page() * b->get_factor() / 8);
-		} else if (b->get_button_index() == MOUSE_BUTTON_WHEEL_RIGHT || (b->get_button_index() == MOUSE_BUTTON_WHEEL_DOWN && Input::get_singleton()->is_key_pressed(KEY_SHIFT))) {
-			h_scroll->set_value(h_scroll->get_value() + h_scroll->get_page() * b->get_factor() / 8);
-		} else if (b->get_button_index() == MOUSE_BUTTON_WHEEL_LEFT || (b->get_button_index() == MOUSE_BUTTON_WHEEL_UP && Input::get_singleton()->is_key_pressed(KEY_SHIFT))) {
-			h_scroll->set_value(h_scroll->get_value() - h_scroll->get_page() * b->get_factor() / 8);
+		int scroll_direction = (b->get_button_index() == MOUSE_BUTTON_WHEEL_DOWN) - (b->get_button_index() == MOUSE_BUTTON_WHEEL_UP);
+		if (scroll_direction != 0) {
+			if (b->is_ctrl_pressed()) {
+				if (b->is_shift_pressed()) {
+					// Horizontal scrolling.
+					h_scroll->set_value(h_scroll->get_value() + (h_scroll->get_page() * b->get_factor() / 8) * scroll_direction);
+				} else {
+					// Vertical scrolling.
+					v_scroll->set_value(v_scroll->get_value() + (v_scroll->get_page() * b->get_factor() / 8) * scroll_direction);
+				}
+			} else {
+				// Zooming.
+				set_zoom_custom(scroll_direction < 0 ? zoom * zoom_step : zoom / zoom_step, b->get_position());
+			}
 		}
 	}
 
@@ -1752,7 +1755,7 @@ GraphEdit::GraphEdit() {
 
 	// Allow dezooming 8 times from the default zoom level.
 	// At low zoom levels, text is unreadable due to its small size and poor filtering,
-	// but this is still useful for previewing purposes.
+	// but this is still useful for previewing and navigation.
 	zoom_min = (1 / Math::pow(zoom_step, 8));
 	// Allow zooming 4 times from the default zoom level.
 	zoom_max = (1 * Math::pow(zoom_step, 4));