michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "nsGfxCheckboxControlFrame.h"
michael@0: #include "nsIContent.h"
michael@0: #include "nsCOMPtr.h"
michael@0: #include "nsRenderingContext.h"
michael@0: #include "nsIDOMHTMLInputElement.h"
michael@0: #include "nsDisplayList.h"
michael@0: #include <algorithm>
michael@0: 
michael@0: using namespace mozilla;
michael@0: 
michael@0: static void
michael@0: PaintCheckMark(nsIFrame* aFrame,
michael@0:                nsRenderingContext* aCtx,
michael@0:                const nsRect& aDirtyRect,
michael@0:                nsPoint aPt)
michael@0: {
michael@0:   nsRect rect(aPt, aFrame->GetSize());
michael@0:   rect.Deflate(aFrame->GetUsedBorderAndPadding());
michael@0: 
michael@0:   // Points come from the coordinates on a 7X7 unit box centered at 0,0
michael@0:   const int32_t checkPolygonX[] = { -3, -1,  3,  3, -1, -3 };
michael@0:   const int32_t checkPolygonY[] = { -1,  1, -3, -1,  3,  1 };
michael@0:   const int32_t checkNumPoints = sizeof(checkPolygonX) / sizeof(int32_t);
michael@0:   const int32_t checkSize      = 9; // 2 units of padding on either side
michael@0:                                     // of the 7x7 unit checkmark
michael@0: 
michael@0:   // Scale the checkmark based on the smallest dimension
michael@0:   nscoord paintScale = std::min(rect.width, rect.height) / checkSize;
michael@0:   nsPoint paintCenter(rect.x + rect.width  / 2,
michael@0:                       rect.y + rect.height / 2);
michael@0: 
michael@0:   nsPoint paintPolygon[checkNumPoints];
michael@0:   // Convert checkmark for screen rendering
michael@0:   for (int32_t polyIndex = 0; polyIndex < checkNumPoints; polyIndex++) {
michael@0:     paintPolygon[polyIndex] = paintCenter +
michael@0:                               nsPoint(checkPolygonX[polyIndex] * paintScale,
michael@0:                                       checkPolygonY[polyIndex] * paintScale);
michael@0:   }
michael@0: 
michael@0:   aCtx->SetColor(aFrame->StyleColor()->mColor);
michael@0:   aCtx->FillPolygon(paintPolygon, checkNumPoints);
michael@0: }
michael@0: 
michael@0: static void
michael@0: PaintIndeterminateMark(nsIFrame* aFrame,
michael@0:                        nsRenderingContext* aCtx,
michael@0:                        const nsRect& aDirtyRect,
michael@0:                        nsPoint aPt)
michael@0: {
michael@0:   nsRect rect(aPt, aFrame->GetSize());
michael@0:   rect.Deflate(aFrame->GetUsedBorderAndPadding());
michael@0: 
michael@0:   rect.y += (rect.height - rect.height/4) / 2;
michael@0:   rect.height /= 4;
michael@0: 
michael@0:   aCtx->SetColor(aFrame->StyleColor()->mColor);
michael@0:   aCtx->FillRect(rect);
michael@0: }
michael@0: 
michael@0: //------------------------------------------------------------
michael@0: nsIFrame*
michael@0: NS_NewGfxCheckboxControlFrame(nsIPresShell* aPresShell,
michael@0:                               nsStyleContext* aContext)
michael@0: {
michael@0:   return new (aPresShell) nsGfxCheckboxControlFrame(aContext);
michael@0: }
michael@0: 
michael@0: NS_IMPL_FRAMEARENA_HELPERS(nsGfxCheckboxControlFrame)
michael@0: 
michael@0: 
michael@0: //------------------------------------------------------------
michael@0: // Initialize GFX-rendered state
michael@0: nsGfxCheckboxControlFrame::nsGfxCheckboxControlFrame(nsStyleContext* aContext)
michael@0: : nsFormControlFrame(aContext)
michael@0: {
michael@0: }
michael@0: 
michael@0: nsGfxCheckboxControlFrame::~nsGfxCheckboxControlFrame()
michael@0: {
michael@0: }
michael@0: 
michael@0: #ifdef ACCESSIBILITY
michael@0: a11y::AccType
michael@0: nsGfxCheckboxControlFrame::AccessibleType()
michael@0: {
michael@0:   return a11y::eHTMLCheckboxType;
michael@0: }
michael@0: #endif
michael@0: 
michael@0: //------------------------------------------------------------
michael@0: void
michael@0: nsGfxCheckboxControlFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
michael@0:                                             const nsRect&           aDirtyRect,
michael@0:                                             const nsDisplayListSet& aLists)
michael@0: {
michael@0:   nsFormControlFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists);
michael@0:   
michael@0:   // Get current checked state through content model.
michael@0:   if ((!IsChecked() && !IsIndeterminate()) || !IsVisibleForPainting(aBuilder))
michael@0:     return;   // we're not checked or not visible, nothing to paint.
michael@0:     
michael@0:   if (IsThemed())
michael@0:     return; // No need to paint the checkmark. The theme will do it.
michael@0: 
michael@0:   aLists.Content()->AppendNewToTop(new (aBuilder)
michael@0:     nsDisplayGeneric(aBuilder, this,
michael@0:                      IsIndeterminate()
michael@0:                      ? PaintIndeterminateMark : PaintCheckMark,
michael@0:                      "CheckedCheckbox",
michael@0:                      nsDisplayItem::TYPE_CHECKED_CHECKBOX));
michael@0: }
michael@0: 
michael@0: //------------------------------------------------------------
michael@0: bool
michael@0: nsGfxCheckboxControlFrame::IsChecked()
michael@0: {
michael@0:   nsCOMPtr<nsIDOMHTMLInputElement> elem(do_QueryInterface(mContent));
michael@0:   bool retval = false;
michael@0:   elem->GetChecked(&retval);
michael@0:   return retval;
michael@0: }
michael@0: 
michael@0: bool
michael@0: nsGfxCheckboxControlFrame::IsIndeterminate()
michael@0: {
michael@0:   nsCOMPtr<nsIDOMHTMLInputElement> elem(do_QueryInterface(mContent));
michael@0:   bool retval = false;
michael@0:   elem->GetIndeterminate(&retval);
michael@0:   return retval;
michael@0: }