Infinite mouse movement for S R shortcuts

src/ui/CMakeLists.txt

@@ -55,6 +55,7 @@ set(
     gradientwidgets/displayedgradientswidget.cpp
     gradientwidgets/gradientslistwidget.cpp
     gradientwidgets/gradientwidget.cpp
+    misc/infinitemousemovement.cpp
     misc/noshortcutaction.cpp
     misc/keyfocustarget.cpp
     optimalscrollarena/minimalscrollwidget.cpp
@@ -126,6 +127,7 @@ set(
     gradientwidgets/displayedgradientswidget.h
     gradientwidgets/gradientslistwidget.h
     gradientwidgets/gradientwidget.h
+    misc/infinitemousemovement.h
     misc/noshortcutaction.h
     misc/keyfocustarget.h
     optimalscrollarena/minimalscrollwidget.h

src/ui/misc/infinitemousemovement.cpp

@@ -0,0 +1,39 @@
+#include "infinitemousemovement.h"
+
+#include <QCursor>
+#include <QScreen>
+#include <QPoint>
+#include <QSize>
+
+bool isCursorInLeft(int x, QSize *screenSize) { return x == 0; }
+bool isCursorInRight(int x, QSize *screenSize) { return x == screenSize->width(); }
+bool isCursorInTop(int y, QSize *screenSize) { return y == 0; }
+bool isCursorInBottom(int y, QSize *screenSize) { return y == screenSize->height(); }
+
+void setCursorMovementInfinite(QScreen *screen) {
+    auto size = screen.availableSize();
+    auto point = QCursor::pos();
+    auto x = point.x();
+    auto y = point.y();
+
+    // Depending on which border the cursor is at (left, right, top, down)
+    // Move the cursor to the inverse direction + 1 px (not to get in an infinite loop)
+    if (isCursorInLeft(point, size)) {
+        // We set the cursor to the edge of the screen minus 1px
+        QCursor::setPos(screen, size.width() - 1, y);
+    };
+    if (isCursorInRight(point, size)) {
+        // We set the cursor to the edge of the screen plus 1px
+        QCursor::setPos(screen, 1, y);
+    }
+    if(isCursorInTop(point, size)) {
+        // We set the cursor to the edge of the screen minus 1px
+        QCursor::setPos(screen, x, size.height() - 1);
+    }
+    if(isCursorInBottom(point, size)) {
+        // We set the cursor to the edge of the screen plus 1px
+        QCursor::setPos(screen, x, 1);
+    }
+}
+
+void setCursorMovementDefault() {}

src/ui/misc/infinitemousemovement.h

@@ -0,0 +1,16 @@
+#ifndef FRICTION_H_INFINITE_MOUSE_MOVEMENT
+#define FRICTION_H_INFINITE_MOUSE_MOVEMENT
+
+/// Allows the mouse to move across the border of the screen and return back to the other side. Is useful for e.g. scaling / rotating an object in the canvas.
+void setCursorMovementInfinite();
+
+/// Blocks the mouse from going across the border of the screen
+void setCursorMovementDefault();
+
+/// Allows the mouse only to move 1px and returns it to original state
+/// (like in a videogame). Could be useful for e.g. blender-style combo boxes.
+/// Should additionally be hidden or change the cursor style,
+/// and make this function return values depending on how much the mouse moves.
+void setCursorMovementLock();
+
+#endif