1 files changed, 624 insertions, 0 deletions

diff --git a/xfa/fwl/cfwl_form.cpp b/xfa/fwl/cfwl_form.cpp
new file mode 100644
index 0000000000..624957163f
--- /dev/null
+++ b/xfa/fwl/cfwl_form.cpp
@@ -0,0 +1,624 @@
+// Copyright 2014 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#include "xfa/fwl/cfwl_form.h"
+
+#include <utility>
+
+#include "third_party/base/ptr_util.h"
+#include "xfa/fde/tto/fde_textout.h"
+#include "xfa/fwl/cfwl_app.h"
+#include "xfa/fwl/cfwl_event.h"
+#include "xfa/fwl/cfwl_formproxy.h"
+#include "xfa/fwl/cfwl_messagemouse.h"
+#include "xfa/fwl/cfwl_notedriver.h"
+#include "xfa/fwl/cfwl_noteloop.h"
+#include "xfa/fwl/cfwl_sysbtn.h"
+#include "xfa/fwl/cfwl_themebackground.h"
+#include "xfa/fwl/cfwl_themepart.h"
+#include "xfa/fwl/cfwl_themetext.h"
+#include "xfa/fwl/cfwl_widgetmgr.h"
+#include "xfa/fwl/ifwl_themeprovider.h"
+#include "xfa/fwl/theme/cfwl_widgettp.h"
+
+namespace {
+
+const int kSystemButtonSize = 21;
+const int kSystemButtonMargin = 5;
+const int kSystemButtonSpan = 2;
+
+}  // namespace
+
+namespace {
+
+const uint8_t kCornerEnlarge = 10;
+
+}  // namespace
+
+CFWL_Form::CFWL_Form(const CFWL_App* app,
+                     std::unique_ptr<CFWL_WidgetProperties> properties,
+                     CFWL_Widget* pOuter)
+    : CFWL_Widget(app, std::move(properties), pOuter),
+#if (_FX_OS_ == _FX_MACOSX_)
+      m_bMouseIn(false),
+#endif
+      m_pCloseBox(nullptr),
+      m_pMinBox(nullptr),
+      m_pMaxBox(nullptr),
+      m_pSubFocus(nullptr),
+      m_fCXBorder(0),
+      m_fCYBorder(0),
+      m_iCaptureBtn(-1),
+      m_iSysBox(0),
+      m_bLButtonDown(false),
+      m_bMaximized(false),
+      m_bSetMaximize(false),
+      m_bDoModalFlag(false) {
+  m_rtRelative.Reset();
+  m_rtRestore.Reset();
+
+  RegisterForm();
+  RegisterEventTarget(nullptr);
+}
+
+CFWL_Form::~CFWL_Form() {
+  UnregisterEventTarget();
+  UnRegisterForm();
+  RemoveSysButtons();
+}
+
+FWL_Type CFWL_Form::GetClassID() const {
+  return FWL_Type::Form;
+}
+
+bool CFWL_Form::IsInstance(const CFX_WideStringC& wsClass) const {
+  if (wsClass == CFX_WideStringC(FWL_CLASS_Form))
+    return true;
+  return CFWL_Widget::IsInstance(wsClass);
+}
+
+void CFWL_Form::GetClientRect(CFX_RectF& rect) {
+  rect = m_pProperties->m_rtWidget;
+  rect.Offset(-rect.left, -rect.top);
+}
+
+void CFWL_Form::Update() {
+  if (m_iLock > 0)
+    return;
+  if (!m_pProperties->m_pThemeProvider)
+    m_pProperties->m_pThemeProvider = GetAvailableTheme();
+
+  Layout();
+}
+
+FWL_WidgetHit CFWL_Form::HitTest(FX_FLOAT fx, FX_FLOAT fy) {
+  GetAvailableTheme();
+
+  if (m_pCloseBox && m_pCloseBox->m_rtBtn.Contains(fx, fy))
+    return FWL_WidgetHit::CloseBox;
+  if (m_pMaxBox && m_pMaxBox->m_rtBtn.Contains(fx, fy))
+    return FWL_WidgetHit::MaxBox;
+  if (m_pMinBox && m_pMinBox->m_rtBtn.Contains(fx, fy))
+    return FWL_WidgetHit::MinBox;
+
+  CFX_RectF rtCap;
+  rtCap.Set(m_fCYBorder, m_fCXBorder,
+            0 - kSystemButtonSize * m_iSysBox - 2 * m_fCYBorder,
+            0 - m_fCXBorder);
+  if (rtCap.Contains(fx, fy))
+    return FWL_WidgetHit::Titlebar;
+  if ((m_pProperties->m_dwStyles & FWL_WGTSTYLE_Border) &&
+      (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_FRM_Resize)) {
+    FX_FLOAT fWidth = m_rtRelative.width - 2 * (m_fCYBorder + kCornerEnlarge);
+    FX_FLOAT fHeight = m_rtRelative.height - 2 * (m_fCXBorder + kCornerEnlarge);
+
+    CFX_RectF rt;
+    rt.Set(0, m_fCXBorder + kCornerEnlarge, m_fCYBorder, fHeight);
+    if (rt.Contains(fx, fy))
+      return FWL_WidgetHit::Left;
+
+    rt.Set(m_rtRelative.width - m_fCYBorder, m_fCXBorder + kCornerEnlarge,
+           m_fCYBorder, fHeight);
+    if (rt.Contains(fx, fy))
+      return FWL_WidgetHit::Right;
+
+    rt.Set(m_fCYBorder + kCornerEnlarge, 0, fWidth, m_fCXBorder);
+    if (rt.Contains(fx, fy))
+      return FWL_WidgetHit::Top;
+
+    rt.Set(m_fCYBorder + kCornerEnlarge, m_rtRelative.height - m_fCXBorder,
+           fWidth, m_fCXBorder);
+    if (rt.Contains(fx, fy))
+      return FWL_WidgetHit::Bottom;
+
+    rt.Set(0, 0, m_fCYBorder + kCornerEnlarge, m_fCXBorder + kCornerEnlarge);
+    if (rt.Contains(fx, fy))
+      return FWL_WidgetHit::LeftTop;
+
+    rt.Set(0, m_rtRelative.height - m_fCXBorder - kCornerEnlarge,
+           m_fCYBorder + kCornerEnlarge, m_fCXBorder + kCornerEnlarge);
+    if (rt.Contains(fx, fy))
+      return FWL_WidgetHit::LeftBottom;
+
+    rt.Set(m_rtRelative.width - m_fCYBorder - kCornerEnlarge, 0,
+           m_fCYBorder + kCornerEnlarge, m_fCXBorder + kCornerEnlarge);
+    if (rt.Contains(fx, fy))
+      return FWL_WidgetHit::RightTop;
+
+    rt.Set(m_rtRelative.width - m_fCYBorder - kCornerEnlarge,
+           m_rtRelative.height - m_fCXBorder - kCornerEnlarge,
+           m_fCYBorder + kCornerEnlarge, m_fCXBorder + kCornerEnlarge);
+    if (rt.Contains(fx, fy))
+      return FWL_WidgetHit::RightBottom;
+  }
+  return FWL_WidgetHit::Client;
+}
+
+void CFWL_Form::DrawWidget(CFX_Graphics* pGraphics, const CFX_Matrix* pMatrix) {
+  if (!pGraphics)
+    return;
+  if (!m_pProperties->m_pThemeProvider)
+    return;
+
+  IFWL_ThemeProvider* pTheme = m_pProperties->m_pThemeProvider;
+  bool bInactive = !IsActive();
+  int32_t iState = bInactive ? CFWL_PartState_Inactive : CFWL_PartState_Normal;
+  if ((m_pProperties->m_dwStyleExes & FWL_STYLEEXT_FRM_NoDrawClient) == 0)
+    DrawBackground(pGraphics, pTheme);
+
+#ifdef FWL_UseMacSystemBorder
+  return;
+#endif
+  CFWL_ThemeBackground param;
+  param.m_pWidget = this;
+  param.m_dwStates = iState;
+  param.m_pGraphics = pGraphics;
+  param.m_rtPart = m_rtRelative;
+  if (pMatrix)
+    param.m_matrix.Concat(*pMatrix);
+  if (m_pProperties->m_dwStyles & FWL_WGTSTYLE_Border) {
+    param.m_iPart = CFWL_Part::Border;
+    pTheme->DrawBackground(&param);
+  }
+  if ((m_pProperties->m_dwStyleExes & FWL_WGTSTYLE_EdgeMask) !=
+      FWL_WGTSTYLE_EdgeNone) {
+    CFX_RectF rtEdge;
+    GetEdgeRect(rtEdge);
+    param.m_iPart = CFWL_Part::Edge;
+    param.m_rtPart = rtEdge;
+    param.m_dwStates = iState;
+    pTheme->DrawBackground(&param);
+  }
+
+#if (_FX_OS_ == _FX_MACOSX_)
+  {
+    if (m_pCloseBox) {
+      param.m_iPart = CFWL_Part::CloseBox;
+      param.m_dwStates = m_pCloseBox->GetPartState();
+      if (m_pProperties->m_dwStates & FWL_WGTSTATE_Deactivated)
+        param.m_dwStates = CFWL_PartState_Disabled;
+      else if (CFWL_PartState_Normal == param.m_dwStates && m_bMouseIn)
+        param.m_dwStates = CFWL_PartState_Hovered;
+      param.m_rtPart = m_pCloseBox->m_rtBtn;
+      pTheme->DrawBackground(&param);
+    }
+    if (m_pMaxBox) {
+      param.m_iPart = CFWL_Part::MaximizeBox;
+      param.m_dwStates = m_pMaxBox->GetPartState();
+      if (m_pProperties->m_dwStates & FWL_WGTSTATE_Deactivated)
+        param.m_dwStates = CFWL_PartState_Disabled;
+      else if (CFWL_PartState_Normal == param.m_dwStates && m_bMouseIn)
+        param.m_dwStates = CFWL_PartState_Hovered;
+      param.m_rtPart = m_pMaxBox->m_rtBtn;
+      param.m_bMaximize = m_bMaximized;
+      pTheme->DrawBackground(&param);
+    }
+    if (m_pMinBox) {
+      param.m_iPart = CFWL_Part::MinimizeBox;
+      param.m_dwStates = m_pMinBox->GetPartState();
+      if (m_pProperties->m_dwStates & FWL_WGTSTATE_Deactivated)
+        param.m_dwStates = CFWL_PartState_Disabled;
+      else if (CFWL_PartState_Normal == param.m_dwStates && m_bMouseIn)
+        param.m_dwStates = CFWL_PartState_Hovered;
+      param.m_rtPart = m_pMinBox->m_rtBtn;
+      pTheme->DrawBackground(&param);
+    }
+    m_bMouseIn = false;
+  }
+#else
+  {
+    if (m_pCloseBox) {
+      param.m_iPart = CFWL_Part::CloseBox;
+      param.m_dwStates = m_pCloseBox->GetPartState();
+      param.m_rtPart = m_pCloseBox->m_rtBtn;
+      pTheme->DrawBackground(&param);
+    }
+    if (m_pMaxBox) {
+      param.m_iPart = CFWL_Part::MaximizeBox;
+      param.m_dwStates = m_pMaxBox->GetPartState();
+      param.m_rtPart = m_pMaxBox->m_rtBtn;
+      param.m_bMaximize = m_bMaximized;
+      pTheme->DrawBackground(&param);
+    }
+    if (m_pMinBox) {
+      param.m_iPart = CFWL_Part::MinimizeBox;
+      param.m_dwStates = m_pMinBox->GetPartState();
+      param.m_rtPart = m_pMinBox->m_rtBtn;
+      pTheme->DrawBackground(&param);
+    }
+  }
+#endif
+}
+
+CFWL_Widget* CFWL_Form::DoModal() {
+  const CFWL_App* pApp = GetOwnerApp();
+  if (!pApp)
+    return nullptr;
+
+  CFWL_NoteDriver* pDriver = pApp->GetNoteDriver();
+  if (!pDriver)
+    return nullptr;
+
+  m_pNoteLoop = pdfium::MakeUnique<CFWL_NoteLoop>();
+  m_pNoteLoop->SetMainForm(this);
+
+  pDriver->PushNoteLoop(m_pNoteLoop.get());
+  m_bDoModalFlag = true;
+  RemoveStates(FWL_WGTSTATE_Invisible);
+  pDriver->Run();
+
+#if _FX_OS_ != _FX_MACOSX_
+  pDriver->PopNoteLoop();
+#endif
+
+  m_pNoteLoop.reset();
+  return nullptr;
+}
+
+void CFWL_Form::EndDoModal() {
+  if (!m_pNoteLoop)
+    return;
+
+  m_bDoModalFlag = false;
+
+#if (_FX_OS_ == _FX_MACOSX_)
+  m_pNoteLoop->EndModalLoop();
+  const CFWL_App* pApp = GetOwnerApp();
+  if (!pApp)
+    return;
+
+  CFWL_NoteDriver* pDriver =
+      static_cast<CFWL_NoteDriver*>(pApp->GetNoteDriver());
+  if (!pDriver)
+    return;
+
+  pDriver->PopNoteLoop();
+  SetStates(FWL_WGTSTATE_Invisible);
+#else
+  SetStates(FWL_WGTSTATE_Invisible);
+  m_pNoteLoop->EndModalLoop();
+#endif
+}
+
+void CFWL_Form::DrawBackground(CFX_Graphics* pGraphics,
+                               IFWL_ThemeProvider* pTheme) {
+  CFWL_ThemeBackground param;
+  param.m_pWidget = this;
+  param.m_iPart = CFWL_Part::Background;
+  param.m_pGraphics = pGraphics;
+  param.m_rtPart = m_rtRelative;
+  param.m_rtPart.Deflate(m_fCYBorder, m_fCXBorder, m_fCYBorder, m_fCXBorder);
+  pTheme->DrawBackground(&param);
+}
+
+void CFWL_Form::RemoveSysButtons() {
+  delete m_pCloseBox;
+  m_pCloseBox = nullptr;
+  delete m_pMinBox;
+  m_pMinBox = nullptr;
+  delete m_pMaxBox;
+  m_pMaxBox = nullptr;
+}
+
+CFWL_SysBtn* CFWL_Form::GetSysBtnAtPoint(FX_FLOAT fx, FX_FLOAT fy) {
+  if (m_pCloseBox && m_pCloseBox->m_rtBtn.Contains(fx, fy))
+    return m_pCloseBox;
+  if (m_pMaxBox && m_pMaxBox->m_rtBtn.Contains(fx, fy))
+    return m_pMaxBox;
+  if (m_pMinBox && m_pMinBox->m_rtBtn.Contains(fx, fy))
+    return m_pMinBox;
+  return nullptr;
+}
+
+CFWL_SysBtn* CFWL_Form::GetSysBtnByState(uint32_t dwState) {
+  if (m_pCloseBox && (m_pCloseBox->m_dwState & dwState))
+    return m_pCloseBox;
+  if (m_pMaxBox && (m_pMaxBox->m_dwState & dwState))
+    return m_pMaxBox;
+  if (m_pMinBox && (m_pMinBox->m_dwState & dwState))
+    return m_pMinBox;
+  return nullptr;
+}
+
+CFWL_SysBtn* CFWL_Form::GetSysBtnByIndex(int32_t nIndex) {
+  if (nIndex < 0)
+    return nullptr;
+
+  CFX_ArrayTemplate<CFWL_SysBtn*> arrBtn;
+  if (m_pMinBox)
+    arrBtn.Add(m_pMinBox);
+  if (m_pMaxBox)
+    arrBtn.Add(m_pMaxBox);
+  if (m_pCloseBox)
+    arrBtn.Add(m_pCloseBox);
+  return arrBtn[nIndex];
+}
+
+int32_t CFWL_Form::GetSysBtnIndex(CFWL_SysBtn* pBtn) {
+  CFX_ArrayTemplate<CFWL_SysBtn*> arrBtn;
+  if (m_pMinBox)
+    arrBtn.Add(m_pMinBox);
+  if (m_pMaxBox)
+    arrBtn.Add(m_pMaxBox);
+  if (m_pCloseBox)
+    arrBtn.Add(m_pCloseBox);
+  return arrBtn.Find(pBtn);
+}
+
+void CFWL_Form::GetEdgeRect(CFX_RectF& rtEdge) {
+  rtEdge = m_rtRelative;
+  if (m_pProperties->m_dwStyles & FWL_WGTSTYLE_Border) {
+    FX_FLOAT fCX = GetBorderSize(true);
+    FX_FLOAT fCY = GetBorderSize(false);
+    rtEdge.Deflate(fCX, fCY, fCX, fCY);
+  }
+}
+
+void CFWL_Form::SetWorkAreaRect() {
+  m_rtRestore = m_pProperties->m_rtWidget;
+  CFWL_WidgetMgr* pWidgetMgr = GetOwnerApp()->GetWidgetMgr();
+  if (!pWidgetMgr)
+    return;
+
+  m_bSetMaximize = true;
+  Repaint(&m_rtRelative);
+}
+
+void CFWL_Form::Layout() {
+  GetRelativeRect(m_rtRelative);
+
+#ifndef FWL_UseMacSystemBorder
+  ResetSysBtn();
+#endif
+}
+
+void CFWL_Form::ResetSysBtn() {
+  m_fCXBorder =
+      *static_cast<FX_FLOAT*>(GetThemeCapacity(CFWL_WidgetCapacity::CXBorder));
+  m_fCYBorder =
+      *static_cast<FX_FLOAT*>(GetThemeCapacity(CFWL_WidgetCapacity::CYBorder));
+  RemoveSysButtons();
+
+  m_iSysBox = 0;
+  if (m_pProperties->m_dwStyles & FWL_WGTSTYLE_CloseBox) {
+    m_pCloseBox = new CFWL_SysBtn;
+    m_pCloseBox->m_rtBtn.Set(
+        m_rtRelative.right() - kSystemButtonMargin - kSystemButtonSize,
+        kSystemButtonMargin, kSystemButtonSize, kSystemButtonSize);
+    m_iSysBox++;
+  }
+  if (m_pProperties->m_dwStyles & FWL_WGTSTYLE_MaximizeBox) {
+    m_pMaxBox = new CFWL_SysBtn;
+    if (m_pCloseBox) {
+      m_pMaxBox->m_rtBtn.Set(
+          m_pCloseBox->m_rtBtn.left - kSystemButtonSpan - kSystemButtonSize,
+          m_pCloseBox->m_rtBtn.top, kSystemButtonSize, kSystemButtonSize);
+    } else {
+      m_pMaxBox->m_rtBtn.Set(
+          m_rtRelative.right() - kSystemButtonMargin - kSystemButtonSize,
+          kSystemButtonMargin, kSystemButtonSize, kSystemButtonSize);
+    }
+    m_iSysBox++;
+  }
+  if (m_pProperties->m_dwStyles & FWL_WGTSTYLE_MinimizeBox) {
+    m_pMinBox = new CFWL_SysBtn;
+    if (m_pMaxBox) {
+      m_pMinBox->m_rtBtn.Set(
+          m_pMaxBox->m_rtBtn.left - kSystemButtonSpan - kSystemButtonSize,
+          m_pMaxBox->m_rtBtn.top, kSystemButtonSize, kSystemButtonSize);
+    } else if (m_pCloseBox) {
+      m_pMinBox->m_rtBtn.Set(
+          m_pCloseBox->m_rtBtn.left - kSystemButtonSpan - kSystemButtonSize,
+          m_pCloseBox->m_rtBtn.top, kSystemButtonSize, kSystemButtonSize);
+    } else {
+      m_pMinBox->m_rtBtn.Set(
+          m_rtRelative.right() - kSystemButtonMargin - kSystemButtonSize,
+          kSystemButtonMargin, kSystemButtonSize, kSystemButtonSize);
+    }
+    m_iSysBox++;
+  }
+}
+
+void CFWL_Form::RegisterForm() {
+  const CFWL_App* pApp = GetOwnerApp();
+  if (!pApp)
+    return;
+
+  CFWL_NoteDriver* pDriver =
+      static_cast<CFWL_NoteDriver*>(pApp->GetNoteDriver());
+  if (!pDriver)
+    return;
+
+  pDriver->RegisterForm(this);
+}
+
+void CFWL_Form::UnRegisterForm() {
+  const CFWL_App* pApp = GetOwnerApp();
+  if (!pApp)
+    return;
+
+  CFWL_NoteDriver* pDriver =
+      static_cast<CFWL_NoteDriver*>(pApp->GetNoteDriver());
+  if (!pDriver)
+    return;
+
+  pDriver->UnRegisterForm(this);
+}
+
+void CFWL_Form::OnProcessMessage(CFWL_Message* pMessage) {
+#ifndef FWL_UseMacSystemBorder
+  if (!pMessage)
+    return;
+
+  switch (pMessage->GetType()) {
+    case CFWL_Message::Type::Mouse: {
+      CFWL_MessageMouse* pMsg = static_cast<CFWL_MessageMouse*>(pMessage);
+      switch (pMsg->m_dwCmd) {
+        case FWL_MouseCommand::LeftButtonDown:
+          OnLButtonDown(pMsg);
+          break;
+        case FWL_MouseCommand::LeftButtonUp:
+          OnLButtonUp(pMsg);
+          break;
+        case FWL_MouseCommand::Move:
+          OnMouseMove(pMsg);
+          break;
+        case FWL_MouseCommand::Leave:
+          OnMouseLeave(pMsg);
+          break;
+        case FWL_MouseCommand::LeftButtonDblClk:
+          OnLButtonDblClk(pMsg);
+          break;
+        default:
+          break;
+      }
+      break;
+    }
+    default:
+      break;
+  }
+#endif  // FWL_UseMacSystemBorder
+}
+
+void CFWL_Form::OnDrawWidget(CFX_Graphics* pGraphics,
+                             const CFX_Matrix* pMatrix) {
+  DrawWidget(pGraphics, pMatrix);
+}
+
+void CFWL_Form::OnLButtonDown(CFWL_MessageMouse* pMsg) {
+  SetGrab(true);
+  m_bLButtonDown = true;
+
+  CFWL_SysBtn* pPressBtn = GetSysBtnAtPoint(pMsg->m_fx, pMsg->m_fy);
+  m_iCaptureBtn = GetSysBtnIndex(pPressBtn);
+
+  if (!pPressBtn)
+    return;
+
+  pPressBtn->SetPressed();
+  Repaint(&pPressBtn->m_rtBtn);
+}
+
+void CFWL_Form::OnLButtonUp(CFWL_MessageMouse* pMsg) {
+  SetGrab(false);
+  m_bLButtonDown = false;
+  CFWL_SysBtn* pPointBtn = GetSysBtnAtPoint(pMsg->m_fx, pMsg->m_fy);
+  CFWL_SysBtn* pPressedBtn = GetSysBtnByIndex(m_iCaptureBtn);
+  if (!pPressedBtn || pPointBtn != pPressedBtn)
+    return;
+  if (pPressedBtn == GetSysBtnByState(FWL_SYSBUTTONSTATE_Pressed))
+    pPressedBtn->SetNormal();
+  if (pPressedBtn == m_pMaxBox) {
+    if (m_bMaximized) {
+      SetWidgetRect(m_rtRestore);
+      Update();
+      Repaint(nullptr);
+    } else {
+      SetWorkAreaRect();
+      Update();
+    }
+    m_bMaximized = !m_bMaximized;
+  } else if (pPressedBtn != m_pMinBox) {
+    CFWL_Event eClose(CFWL_Event::Type::Close, this);
+    DispatchEvent(&eClose);
+  }
+}
+
+void CFWL_Form::OnMouseMove(CFWL_MessageMouse* pMsg) {
+  if (m_bLButtonDown)
+    return;
+
+  CFX_RectF rtInvalidate;
+  rtInvalidate.Reset();
+  CFWL_SysBtn* pPointBtn = GetSysBtnAtPoint(pMsg->m_fx, pMsg->m_fy);
+  CFWL_SysBtn* pOldHover = GetSysBtnByState(FWL_SYSBUTTONSTATE_Hover);
+
+#if _FX_OS_ == _FX_MACOSX_
+  {
+    if (pOldHover && pPointBtn != pOldHover)
+      pOldHover->SetNormal();
+    if (pPointBtn && pPointBtn != pOldHover)
+      pPointBtn->SetHover();
+    if (m_pCloseBox)
+      rtInvalidate = m_pCloseBox->m_rtBtn;
+    if (m_pMaxBox) {
+      if (rtInvalidate.IsEmpty())
+        rtInvalidate = m_pMaxBox->m_rtBtn;
+      else
+        rtInvalidate.Union(m_pMaxBox->m_rtBtn);
+    }
+    if (m_pMinBox) {
+      if (rtInvalidate.IsEmpty())
+        rtInvalidate = m_pMinBox->m_rtBtn;
+      else
+        rtInvalidate.Union(m_pMinBox->m_rtBtn);
+    }
+    if (!rtInvalidate.IsEmpty() &&
+        rtInvalidate.Contains(pMsg->m_fx, pMsg->m_fy)) {
+      m_bMouseIn = true;
+    }
+  }
+#else
+  {
+    if (pOldHover && pPointBtn != pOldHover) {
+      pOldHover->SetNormal();
+      rtInvalidate = pOldHover->m_rtBtn;
+    }
+    if (pPointBtn && pPointBtn != pOldHover) {
+      pPointBtn->SetHover();
+      if (rtInvalidate.IsEmpty())
+        rtInvalidate = pPointBtn->m_rtBtn;
+      else
+        rtInvalidate.Union(pPointBtn->m_rtBtn);
+    }
+  }
+#endif
+
+  if (!rtInvalidate.IsEmpty())
+    Repaint(&rtInvalidate);
+}
+
+void CFWL_Form::OnMouseLeave(CFWL_MessageMouse* pMsg) {
+  CFWL_SysBtn* pHover = GetSysBtnByState(FWL_SYSBUTTONSTATE_Hover);
+  if (!pHover)
+    return;
+
+  pHover->SetNormal();
+  Repaint(&pHover->m_rtBtn);
+}
+
+void CFWL_Form::OnLButtonDblClk(CFWL_MessageMouse* pMsg) {
+  if ((m_pProperties->m_dwStyleExes & FWL_STYLEEXT_FRM_Resize) &&
+      HitTest(pMsg->m_fx, pMsg->m_fy) == FWL_WidgetHit::Titlebar) {
+    if (m_bMaximized)
+      SetWidgetRect(m_rtRestore);
+    else
+      SetWorkAreaRect();
+
+    Update();
+    m_bMaximized = !m_bMaximized;
+  }
+}