Added initial implementation of FollowSlideWrap.

CMakeLists.txt

@@ -233,6 +233,8 @@ PRIVATE
     ui/widgets/tooltip.h
     ui/wrap/fade_wrap.cpp
     ui/wrap/fade_wrap.h
+    ui/wrap/follow_slide_wrap.cpp
+    ui/wrap/follow_slide_wrap.h
     ui/wrap/padding_wrap.cpp
     ui/wrap/padding_wrap.h
     ui/wrap/slide_wrap.cpp

ui/wrap/follow_slide_wrap.cpp

@@ -0,0 +1,47 @@
+// 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
+//
+#include "ui/wrap/follow_slide_wrap.h"
+
+#include "styles/style_basic.h"
+
+namespace Ui {
+
+FollowSlideWrap<RpWidget>::FollowSlideWrap(
+	QWidget *parent,
+	object_ptr<RpWidget> &&child)
+: Parent(parent, std::move(child))
+, _duration(st::slideWrapDuration) {
+	if (const auto weak = wrapped()) {
+		wrappedSizeUpdated(weak->size());
+	}
+}
+
+FollowSlideWrap<RpWidget> *FollowSlideWrap<RpWidget>::setDuration(
+		crl::time duration) {
+	_duration = duration;
+	return this;
+}
+
+int FollowSlideWrap<RpWidget>::naturalWidth() const {
+	return -1;
+}
+
+void FollowSlideWrap<RpWidget>::wrappedSizeUpdated(QSize size) {
+	updateWrappedPosition(size.height());
+}
+
+void FollowSlideWrap<RpWidget>::updateWrappedPosition(int forHeight) {
+	_animation.stop();
+	_animation.start(
+		[=](float64 value) { resize(width(), value); },
+		height(),
+		forHeight,
+		_duration);
+}
+
+} // namespace Ui
+

ui/wrap/follow_slide_wrap.h

@@ -0,0 +1,54 @@
+// 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 "ui/effects/animations.h"
+#include "ui/wrap/wrap.h"
+
+namespace Ui {
+
+template <typename Widget = RpWidget>
+class FollowSlideWrap;
+
+template <>
+class FollowSlideWrap<RpWidget> : public Wrap<RpWidget> {
+	using Parent = Wrap<RpWidget>;
+
+public:
+	FollowSlideWrap(
+		QWidget *parent,
+		object_ptr<RpWidget> &&child);
+
+	FollowSlideWrap *setDuration(crl::time duration);
+	int naturalWidth() const override;
+
+protected:
+	void wrappedSizeUpdated(QSize size) override;
+
+private:
+	void updateWrappedPosition(int forHeight);
+
+	Animations::Simple _animation;
+	crl::time _duration = 0;
+
+};
+
+template <typename Widget>
+class FollowSlideWrap : public Wrap<Widget, FollowSlideWrap<RpWidget>> {
+	using Parent = Wrap<Widget, FollowSlideWrap<RpWidget>>;
+
+public:
+	FollowSlideWrap(
+		QWidget *parent,
+		object_ptr<Widget> &&child)
+	: Parent(parent, std::move(child)) {
+	}
+
+};
+
+} // namespace Ui
+