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godot/scene/gui/view_panner.cpp

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/**************************************************************************/
/* view_panner.cpp */
/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/**************************************************************************/
#include "view_panner.h"
#include "core/input/input.h"
#include "core/input/shortcut.h"
#include "core/os/keyboard.h"
bool ViewPanner::gui_input(const Ref<InputEvent> &p_event, Rect2 p_canvas_rect) {
Ref<InputEventMouseButton> mb = p_event;
if (mb.is_valid()) {
Vector2 scroll_vec = Vector2((mb->get_button_index() == MouseButton::WHEEL_RIGHT) - (mb->get_button_index() == MouseButton::WHEEL_LEFT), (mb->get_button_index() == MouseButton::WHEEL_DOWN) - (mb->get_button_index() == MouseButton::WHEEL_UP));
// Moving the scroll wheel sends two events: one with pressed as true,
// and one with pressed as false. Make sure we only process one of them.
if (scroll_vec != Vector2() && mb->is_pressed()) {
if (control_scheme == SCROLL_PANS) {
if (mb->is_ctrl_pressed()) {
if (scroll_vec.y != 0) {
// Compute the zoom factor.
float zoom_factor = mb->get_factor() <= 0 ? 1.0 : mb->get_factor();
zoom_factor = ((scroll_zoom_factor - 1.0) * zoom_factor) + 1.0;
float zoom = scroll_vec.y > 0 ? 1.0 / scroll_zoom_factor : scroll_zoom_factor;
zoom_callback.call(zoom, mb->get_position(), p_event);
return true;
}
} else {
Vector2 panning = scroll_vec * mb->get_factor();
if (pan_axis == PAN_AXIS_HORIZONTAL) {
panning = Vector2(panning.x + panning.y, 0);
} else if (pan_axis == PAN_AXIS_VERTICAL) {
panning = Vector2(0, panning.x + panning.y);
} else if (mb->is_shift_pressed()) {
panning = Vector2(panning.y, panning.x);
}
pan_callback.call(-panning * scroll_speed, p_event);
return true;
}
} else {
if (mb->is_ctrl_pressed()) {
Vector2 panning = scroll_vec * mb->get_factor();
if (pan_axis == PAN_AXIS_HORIZONTAL) {
panning = Vector2(panning.x + panning.y, 0);
} else if (pan_axis == PAN_AXIS_VERTICAL) {
panning = Vector2(0, panning.x + panning.y);
} else if (mb->is_shift_pressed()) {
panning = Vector2(panning.y, panning.x);
}
pan_callback.call(-panning * scroll_speed, p_event);
return true;
} else if (!mb->is_shift_pressed() && scroll_vec.y != 0) {
// Compute the zoom factor.
float zoom_factor = mb->get_factor() <= 0 ? 1.0 : mb->get_factor();
zoom_factor = ((scroll_zoom_factor - 1.0) * zoom_factor) + 1.0;
float zoom = scroll_vec.y > 0 ? 1.0 / scroll_zoom_factor : scroll_zoom_factor;
zoom_callback.call(zoom, mb->get_position(), p_event);
return true;
}
}
}
// Alt is not used for button presses, so ignore it.
if (mb->is_alt_pressed()) {
return false;
}
bool is_drag_event = mb->get_button_index() == MouseButton::MIDDLE ||
(enable_rmb && mb->get_button_index() == MouseButton::RIGHT) ||
(!simple_panning_enabled && mb->get_button_index() == MouseButton::LEFT && is_panning()) ||
(force_drag && mb->get_button_index() == MouseButton::LEFT);
if (is_drag_event) {
if (mb->is_pressed()) {
is_dragging = true;
} else {
is_dragging = false;
}
return mb->get_button_index() != MouseButton::LEFT || mb->is_pressed(); // Don't consume LMB release events (it fixes some selection problems).
}
}
Ref<InputEventMouseMotion> mm = p_event;
if (mm.is_valid()) {
if (is_dragging) {
if (p_canvas_rect != Rect2()) {
pan_callback.call(Input::get_singleton()->warp_mouse_motion(mm, p_canvas_rect), p_event);
} else {
pan_callback.call(mm->get_relative(), p_event);
}
return true;
}
}
Ref<InputEventMagnifyGesture> magnify_gesture = p_event;
if (magnify_gesture.is_valid()) {
// Zoom gesture
zoom_callback.call(magnify_gesture->get_factor(), magnify_gesture->get_position(), p_event);
return true;
}
Ref<InputEventPanGesture> pan_gesture = p_event;
if (pan_gesture.is_valid()) {
if (pan_gesture->is_ctrl_pressed()) {
// Zoom gesture.
float pan_zoom_factor = 1.02f;
float zoom_direction = pan_gesture->get_delta().x - pan_gesture->get_delta().y;
if (zoom_direction == 0.f) {
return true;
}
float zoom = zoom_direction < 0 ? 1.0 / pan_zoom_factor : pan_zoom_factor;
zoom_callback.call(zoom, pan_gesture->get_position(), p_event);
return true;
}
pan_callback.call(-pan_gesture->get_delta() * scroll_speed, p_event);
}
Ref<InputEventScreenDrag> screen_drag = p_event;
if (screen_drag.is_valid()) {
if (Input::get_singleton()->is_emulating_mouse_from_touch() || Input::get_singleton()->is_emulating_touch_from_mouse()) {
// This set of events also generates/is generated by
// InputEventMouseButton/InputEventMouseMotion events which will be processed instead.
} else {
pan_callback.call(screen_drag->get_relative(), p_event);
}
}
Ref<InputEventKey> k = p_event;
if (k.is_valid()) {
if (pan_view_shortcut.is_valid() && pan_view_shortcut->matches_event(k)) {
pan_key_pressed = k->is_pressed();
if (simple_panning_enabled || Input::get_singleton()->get_mouse_button_mask().has_flag(MouseButtonMask::LEFT)) {
is_dragging = pan_key_pressed;
}
return true;
}
}
return false;
}
void ViewPanner::release_pan_key() {
pan_key_pressed = false;
is_dragging = false;
}
void ViewPanner::set_callbacks(Callable p_pan_callback, Callable p_zoom_callback) {
pan_callback = p_pan_callback;
zoom_callback = p_zoom_callback;
}
void ViewPanner::set_control_scheme(ControlScheme p_scheme) {
control_scheme = p_scheme;
}
void ViewPanner::set_enable_rmb(bool p_enable) {
enable_rmb = p_enable;
}
void ViewPanner::set_pan_shortcut(Ref<Shortcut> p_shortcut) {
pan_view_shortcut = p_shortcut;
pan_key_pressed = false;
}
void ViewPanner::set_simple_panning_enabled(bool p_enabled) {
simple_panning_enabled = p_enabled;
}
void ViewPanner::set_scroll_speed(int p_scroll_speed) {
ERR_FAIL_COND(p_scroll_speed <= 0);
scroll_speed = p_scroll_speed;
}
void ViewPanner::set_scroll_zoom_factor(float p_scroll_zoom_factor) {
ERR_FAIL_COND(p_scroll_zoom_factor <= 1.0);
scroll_zoom_factor = p_scroll_zoom_factor;
}
void ViewPanner::set_pan_axis(PanAxis p_pan_axis) {
pan_axis = p_pan_axis;
}
void ViewPanner::setup(ControlScheme p_scheme, Ref<Shortcut> p_shortcut, bool p_simple_panning) {
set_control_scheme(p_scheme);
set_pan_shortcut(p_shortcut);
set_simple_panning_enabled(p_simple_panning);
}
bool ViewPanner::is_panning() const {
return is_dragging || pan_key_pressed;
}
void ViewPanner::set_force_drag(bool p_force) {
force_drag = p_force;
}
ViewPanner::ViewPanner() {
Array inputs;
inputs.append(InputEventKey::create_reference(Key::SPACE));
pan_view_shortcut.instantiate();
pan_view_shortcut->set_events(inputs);
}
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