From b2f79a74d474a8c6751ec8d30e72e88b2bdb3703 Mon Sep 17 00:00:00 2001
From: Matthew Olsson <matthewcolsson@gmail.com>
Date: Sun, 27 Mar 2022 09:11:02 -0700
Subject: [PATCH] PDFViewer: Clear rendered page cache on application resize

When resizing the application, the pages are expected to grow or shrink
proportionally. This means that after a resize, we need to rerender
every page.
---
 Userland/Applications/PDFViewer/PDFViewer.cpp | 7 +++++++
 Userland/Applications/PDFViewer/PDFViewer.h   | 6 ++++++
 2 files changed, 13 insertions(+)

diff --git a/Userland/Applications/PDFViewer/PDFViewer.cpp b/Userland/Applications/PDFViewer/PDFViewer.cpp
index b756ea3dd8..eedee72d24 100644
--- a/Userland/Applications/PDFViewer/PDFViewer.cpp
+++ b/Userland/Applications/PDFViewer/PDFViewer.cpp
@@ -101,6 +101,13 @@ void PDFViewer::paint_event(GUI::PaintEvent& event)
     painter.blit({ x, y }, *page, page->rect());
 }
 
+void PDFViewer::resize_event(GUI::ResizeEvent&)
+{
+    for (auto& map : m_rendered_page_list)
+        map.clear();
+    update();
+}
+
 void PDFViewer::mousewheel_event(GUI::MouseEvent& event)
 {
     if (!m_document)
diff --git a/Userland/Applications/PDFViewer/PDFViewer.h b/Userland/Applications/PDFViewer/PDFViewer.h
index 5f53958087..374bbfb790 100644
--- a/Userland/Applications/PDFViewer/PDFViewer.h
+++ b/Userland/Applications/PDFViewer/PDFViewer.h
@@ -18,6 +18,11 @@ class PDFViewer : public GUI::AbstractScrollableWidget {
     C_OBJECT(PDFViewer)
 
 public:
+    enum class PageViewMode {
+        Single,
+        Multiple,
+    };
+
     virtual ~PDFViewer() override = default;
 
     ALWAYS_INLINE u32 current_page() const { return m_current_page_index; }
@@ -37,6 +42,7 @@ protected:
     PDFViewer();
 
     virtual void paint_event(GUI::PaintEvent&) override;
+    virtual void resize_event(GUI::ResizeEvent&) override;
     virtual void mousewheel_event(GUI::MouseEvent&) override;
     virtual void mousedown_event(GUI::MouseEvent&) override;
     virtual void mouseup_event(GUI::MouseEvent&) override;