Change IFWL_Widget to store a single delegate.

xfa/fxfa/app/cxfa_ffpushbuttondelegate.cpp

+// Copyright 2016 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/fxfa/app/cxfa_ffpushbuttondelegate.h"
+
+#include "xfa/fwl/core/cfwl_widget.h"
+#include "xfa/fwl/core/ifwl_pushbutton.h"
+#include "xfa/fxfa/app/xfa_fffield.h"
+#include "xfa/fxfa/app/xfa_ffpushbutton.h"
+#include "xfa/fxgraphics/cfx_color.h"
+#include "xfa/fxgraphics/cfx_path.h"
+
+CXFA_FFPushButtonDelegate::CXFA_FFPushButtonDelegate(
+    std::unique_ptr<IFWL_WidgetDelegate> pDelegate,
+    CXFA_FFPushButton* const pWidget)
+    : CXFA_FFFieldDelegate(std::move(pDelegate), pWidget) {}
+
+CXFA_FFPushButtonDelegate::~CXFA_FFPushButtonDelegate() {}
+
+void CXFA_FFPushButtonDelegate::OnProcessMessage(CFWL_Message* pMessage) {
+  m_pDelegate->OnProcessMessage(pMessage);
+}
+
+void CXFA_FFPushButtonDelegate::OnProcessEvent(CFWL_Event* pEvent) {
+  m_pDelegate->OnProcessEvent(pEvent);
+  CXFA_FFFieldDelegate::OnProcessEvent(pEvent);
+}
+
+void CXFA_FFPushButtonDelegate::OnDrawWidget(CFX_Graphics* pGraphics,
+                                             const CFX_Matrix* pMatrix) {
+  CFWL_Widget* pNormalWidget =
+      static_cast<CXFA_FFField*>(m_pWidget)->GetNormalWidget();
+  CXFA_FFPushButton* widget = static_cast<CXFA_FFPushButton*>(m_pWidget);
+
+  if (pNormalWidget->GetStylesEx() & XFA_FWL_PSBSTYLEEXT_HiliteInverted) {
+    if ((pNormalWidget->GetStates() & FWL_STATE_PSB_Pressed) &&
+        (pNormalWidget->GetStates() & FWL_STATE_PSB_Hovered)) {
+      CFX_RectF rtFill;
+      pNormalWidget->GetWidgetRect(rtFill);
+      rtFill.left = rtFill.top = 0;
+      FX_FLOAT fLineWith = widget->GetLineWidth();
+      rtFill.Deflate(fLineWith, fLineWith);
+      CFX_Color cr(FXARGB_MAKE(128, 128, 255, 255));
+      pGraphics->SetFillColor(&cr);
+      CFX_Path path;
+      path.Create();
+      path.AddRectangle(rtFill.left, rtFill.top, rtFill.width, rtFill.height);
+      pGraphics->FillPath(&path, FXFILL_WINDING, (CFX_Matrix*)pMatrix);
+    }
+  } else if (pNormalWidget->GetStylesEx() & XFA_FWL_PSBSTYLEEXT_HiliteOutLine) {
+    if ((pNormalWidget->GetStates() & FWL_STATE_PSB_Pressed) &&
+        (pNormalWidget->GetStates() & FWL_STATE_PSB_Hovered)) {
+      FX_FLOAT fLineWidth = widget->GetLineWidth();
+      CFX_Color cr(FXARGB_MAKE(255, 128, 255, 255));
+      pGraphics->SetStrokeColor(&cr);
+      pGraphics->SetLineWidth(fLineWidth);
+      CFX_Path path;
+      path.Create();
+      CFX_RectF rect;
+      pNormalWidget->GetWidgetRect(rect);
+      path.AddRectangle(0, 0, rect.width, rect.height);
+      pGraphics->StrokePath(&path, (CFX_Matrix*)pMatrix);
+    }
+  }
+}