Added initial list of functions for geometry calculations.

CMakeLists.txt

@@ -270,6 +270,7 @@ PRIVATE
     ui/painter.h
     ui/ph.cpp
     ui/ph.h
+    ui/rect.h
     ui/rect_part.h
     ui/round_rect.cpp
     ui/round_rect.h

ui/rect.h

@@ -0,0 +1,107 @@
+// This file is part of Desktop App Toolkit,
+// a set of libraries for developing nice desktop applications.
+//
+// For license and copyright information please follow this link:
+// https://github.com/desktop-app/legal/blob/master/LEGAL
+//
+#pragma once
+
+#include <QtCore/QRect>
+
+namespace rect {
+
+// Margins.
+namespace m {
+namespace sum {
+
+/*
+	Horizontal.
+	rect::m::sum::h(mypadding);
+*/
+[[nodiscard]] int h(const QMargins &margins) {
+	return margins.left() + margins.right();
+}
+
+[[nodiscard]] float64 h(const QMarginsF &margins) {
+	return margins.left() + margins.right();
+}
+
+/*
+	Vertical.
+	rect::m::sum::v(mypadding);
+*/
+[[nodiscard]] int v(const QMargins &margins) {
+	return margins.top() + margins.bottom();
+}
+
+[[nodiscard]] float64 v(const QMarginsF &margins) {
+	return margins.top() + margins.bottom();
+}
+
+} // namespace sum
+} // namespace m
+
+/*
+	rect::right(mywidget);
+*/
+[[nodiscard]] int right(const QRect &r) {
+	return r.left() + r.width();
+}
+
+[[nodiscard]] float64 right(const QRectF &r) {
+	return r.left() + r.width();
+}
+
+[[nodiscard]] int right(not_null<QWidget*> w) {
+	return w->x() + w->width();
+}
+
+/*
+	rect::bottom(mywidget);
+*/
+[[nodiscard]] int bottom(const QRect &r) {
+	return r.top() + r.height();
+}
+
+[[nodiscard]] float64 bottom(const QRectF &r) {
+	return r.top() + r.height();
+}
+
+[[nodiscard]] int bottom(not_null<const QWidget*> w) {
+	return w->y() + w->height();
+}
+
+} // namespace rect
+
+/*
+	Rect(mysize);
+*/
+[[nodiscard]] QRect Rect(const QSize &s) {
+	return QRect(QPoint(), s);
+}
+
+[[nodiscard]] QRectF Rect(const QSizeF &s) {
+	return QRectF(QPointF(), s);
+}
+
+/*
+	Size(myside);
+*/
+[[nodiscard]] QSize Size(int side) {
+	return QSize(side, side);
+}
+
+[[nodiscard]] QSizeF Size(float64 side) {
+	return QSizeF(side, side);
+}
+
+/*
+	Margins(myvalue);
+*/
+[[nodiscard]] QMargins Margins(int side) {
+	return QMargins{ side, side, side, side };
+}
+
+[[nodiscard]] QMarginsF Margins(float64 side) {
+	return QMarginsF{ side, side, side, side };
+}