From aa16cd0c166c663173b830928d7a6ad3bf400fe5 Mon Sep 17 00:00:00 2001
From: John Preston <johnprestonmail@gmail.com>
Date: Tue, 19 Oct 2021 19:57:17 +0400
Subject: [PATCH] Allow custom rounded corners in boxes.

---
 ui/layers/box_content.cpp      |  5 +++++
 ui/layers/box_content.h        |  4 ++++
 ui/layers/box_layer_widget.cpp | 21 +++++++++++++--------
 3 files changed, 22 insertions(+), 8 deletions(-)

diff --git a/ui/layers/box_content.cpp b/ui/layers/box_content.cpp
index fffe8b1..8e45c8e 100644
--- a/ui/layers/box_content.cpp
+++ b/ui/layers/box_content.cpp
@@ -12,6 +12,7 @@
 #include "ui/widgets/shadow.h"
 #include "ui/wrap/fade_wrap.h"
 #include "ui/text/text_utilities.h"
+#include "ui/rect_part.h"
 #include "ui/painter.h"
 #include "base/timer.h"
 #include "styles/style_layers.h"
@@ -103,6 +104,10 @@ void BoxContent::scrollToWidget(not_null<QWidget*> widget) {
 	}
 }
 
+RectParts BoxContent::customCornersFilling() {
+	return {};
+}
+
 void BoxContent::onScrollToY(int top, int bottom) {
 	if (_scroll) {
 		_scroll->scrollToY(top, bottom);
diff --git a/ui/layers/box_content.h b/ui/layers/box_content.h
index d5eb32e..1870a99 100644
--- a/ui/layers/box_content.h
+++ b/ui/layers/box_content.h
@@ -15,6 +15,9 @@
 #include "ui/text/text_entity.h"
 #include "ui/rp_widget.h"
 
+enum class RectPart;
+using RectParts = base::flags<RectPart>;
+
 namespace style {
 struct RoundButton;
 struct IconButton;
@@ -128,6 +131,7 @@ public:
 
 	virtual void showFinished() {
 	}
+	virtual RectParts customCornersFilling();
 	void clearButtons() {
 		getDelegate()->clearButtons();
 	}
diff --git a/ui/layers/box_layer_widget.cpp b/ui/layers/box_layer_widget.cpp
index 02a7d75..cd2b494 100644
--- a/ui/layers/box_layer_widget.cpp
+++ b/ui/layers/box_layer_widget.cpp
@@ -115,16 +115,21 @@ QRect BoxLayerWidget::loadingRect() const {
 
 void BoxLayerWidget::paintEvent(QPaintEvent *e) {
 	Painter p(this);
-	auto clip = e->rect();
-	auto paintTopRounded = clip.intersects(QRect(0, 0, width(), st::boxRadius));
-	auto paintBottomRounded = clip.intersects(QRect(0, height() - st::boxRadius, width(), st::boxRadius));
+
+	const auto custom = _content->customCornersFilling();
+	const auto clip = e->rect();
+	const auto paintTopRounded = !(custom & RectPart::FullTop)
+		&& clip.intersects(QRect(0, 0, width(), st::boxRadius));
+	const auto paintBottomRounded = !(custom & RectPart::FullBottom)
+		&& clip.intersects(
+			QRect(0, height() - st::boxRadius, width(), st::boxRadius));
 	if (paintTopRounded || paintBottomRounded) {
-		auto parts = RectPart::None | 0;
-		if (paintTopRounded) parts |= RectPart::FullTop;
-		if (paintBottomRounded) parts |= RectPart::FullBottom;
-		_roundRect.paint(p, rect(), parts);
+		_roundRect.paint(p, rect(), RectPart::None
+			| (paintTopRounded ? RectPart::FullTop : RectPart::None)
+			| (paintBottomRounded ? RectPart::FullBottom : RectPart::None));
 	}
-	auto other = e->region().intersected(QRect(0, st::boxRadius, width(), height() - 2 * st::boxRadius));
+	const auto other = e->region().intersected(
+		QRect(0, st::boxRadius, width(), height() - 2 * st::boxRadius));
 	if (!other.isEmpty()) {
 		for (const auto &rect : other) {
 			p.fillRect(rect, st().bg);