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gecko-dev/layout/base/nsCaret.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
* Pierre Phaneuf <pp@ludusdesign.com>
*/
#include "nsCOMPtr.h"
#include "nsITimer.h"
#include "nsITimerCallback.h"
#include "nsIComponentManager.h"
#include "nsIFrameSelection.h"
#include "nsIFrame.h"
#include "nsIDOMNode.h"
#include "nsIDOMRange.h"
#include "nsIFontMetrics.h"
#include "nsISelection.h"
#include "nsISelectionPrivate.h"
#include "nsIDOMCharacterData.h"
#include "nsIContent.h"
#include "nsIPresShell.h"
#include "nsIRenderingContext.h"
#include "nsIDeviceContext.h"
#include "nsIView.h"
#include "nsIScrollableView.h"
#include "nsIViewManager.h"
#include "nsIPresContext.h"
#include "nsILookAndFeel.h"
#include "nsWidgetsCID.h" // for NS_LOOKANDFEEL_CID
#include "nsBlockFrame.h"
#include "nsISelectionController.h"
#include "nsCaret.h"
// Because of drawing issues, we currently always make a new RC. See bug 28068
// Before removing this, stuff will need to be fixed and tested on all platforms.
// For example, turning this off on Mac right now causes drawing problems on pages
// with form elements.
#define DONT_REUSE_RENDERING_CONTEXT
#ifdef IBMBIDI
//-------------------------------IBM BIDI--------------------------------------
// Mamdouh : Modifiaction of the caret to work with Bidi in the LTR and RTL
#include "nsIPref.h"
#include "nsLayoutAtoms.h"
//------------------------------END OF IBM BIDI--------------------------------
#endif //IBMBIDI
static NS_DEFINE_IID(kLookAndFeelCID, NS_LOOKANDFEEL_CID);
//-----------------------------------------------------------------------------
nsCaret::nsCaret()
: mPresShell(nsnull)
, mBlinkRate(500)
, mCaretTwipsWidth(-1)
, mCaretPixelsWidth(1)
, mVisible(PR_FALSE)
, mDrawn(PR_FALSE)
, mReadOnly(PR_FALSE)
, mShowDuringSelection(PR_FALSE)
, mLastCaretFrame(nsnull)
, mLastCaretView(nsnull)
, mLastContentOffset(0)
{
NS_INIT_REFCNT();
}
//-----------------------------------------------------------------------------
nsCaret::~nsCaret()
{
KillTimer();
}
//-----------------------------------------------------------------------------
NS_IMETHODIMP nsCaret::Init(nsIPresShell *inPresShell)
{
if (!inPresShell)
return NS_ERROR_NULL_POINTER;
mPresShell = getter_AddRefs(NS_GetWeakReference(inPresShell)); // the presshell owns us, so no addref
nsILookAndFeel* touchyFeely;
if (NS_SUCCEEDED(nsComponentManager::CreateInstance(kLookAndFeelCID, nsnull, NS_GET_IID(nsILookAndFeel), (void**)&touchyFeely)))
{
PRInt32 tempInt;
if (NS_SUCCEEDED(touchyFeely->GetMetric(nsILookAndFeel::eMetric_SingleLineCaretWidth, tempInt)))
mCaretTwipsWidth = (nscoord)tempInt;
if (NS_SUCCEEDED(touchyFeely->GetMetric(nsILookAndFeel::eMetric_CaretBlinkTime, tempInt)))
mBlinkRate = (PRUint32)tempInt;
if (NS_SUCCEEDED(touchyFeely->GetMetric(nsILookAndFeel::eMetric_ShowCaretDuringSelection, tempInt)))
mShowDuringSelection = tempInt ? PR_TRUE : PR_FALSE;
NS_RELEASE(touchyFeely);
}
// get the selection from the pres shell, and set ourselves up as a selection
// listener
nsCOMPtr<nsISelection> domSelection;
nsCOMPtr<nsISelectionPrivate> privateSelection;
nsCOMPtr<nsISelectionController> selCon = do_QueryReferent(mPresShell);
if (selCon)
{
if (NS_SUCCEEDED(selCon->GetSelection(nsISelectionController::SELECTION_NORMAL, getter_AddRefs(domSelection))))
{
privateSelection = do_QueryInterface(domSelection);
privateSelection->AddSelectionListener(this);
mDomSelectionWeak = getter_AddRefs( NS_GetWeakReference(domSelection) );
}
}
else
return NS_ERROR_FAILURE;
// set up the blink timer
if (mVisible)
{
nsresult err = StartBlinking();
if (NS_FAILED(err))
return err;
}
#ifdef IBMBIDI
PRBool isRTL;
mBidiKeyboard = do_GetService("@mozilla.org/widget/bidikeyboard;1");
mBidiKeyboard->IsLangRTL(&isRTL);
mKeyboardRTL = isRTL;
#endif
return NS_OK;
}
//-----------------------------------------------------------------------------
NS_IMPL_ADDREF(nsCaret);
NS_IMPL_RELEASE(nsCaret);
//-----------------------------------------------------------------------------
NS_IMETHODIMP nsCaret::QueryInterface(const nsIID& aIID,
void** aInstancePtrResult)
{
NS_PRECONDITION(aInstancePtrResult, "null pointer");
if (!aInstancePtrResult)
return NS_ERROR_NULL_POINTER;
nsISupports* foundInterface;
if (aIID.Equals(NS_GET_IID(nsISupports)))
foundInterface = (nsISupports*)(nsICaret*)this; // whoo boy
else if (aIID.Equals(NS_GET_IID(nsICaret)))
foundInterface = (nsICaret*)this;
else if (aIID.Equals(NS_GET_IID(nsISelectionListener)))
foundInterface = (nsISelectionListener*)this;
else
foundInterface = nsnull;
nsresult status;
if (! foundInterface)
status = NS_NOINTERFACE;
else
{
NS_ADDREF(foundInterface);
status = NS_OK;
}
*aInstancePtrResult = foundInterface;
return status;
}
//-----------------------------------------------------------------------------
NS_IMETHODIMP nsCaret::SetCaretDOMSelection(nsISelection *aDOMSel)
{
NS_ENSURE_ARG_POINTER(aDOMSel);
mDomSelectionWeak = getter_AddRefs( NS_GetWeakReference(aDOMSel) ); // weak reference to pres shell
return NS_OK;
}
//-----------------------------------------------------------------------------
NS_IMETHODIMP nsCaret::SetCaretVisible(PRBool inMakeVisible)
{
mVisible = inMakeVisible;
nsresult err = NS_OK;
if (mVisible)
err = StartBlinking();
else
err = StopBlinking();
return err;
}
NS_IMETHODIMP nsCaret::GetCaretVisible(PRBool *outMakeVisible)
{
NS_ENSURE_ARG_POINTER(outMakeVisible);
*outMakeVisible = mVisible;
return NS_OK;
}
//-----------------------------------------------------------------------------
NS_IMETHODIMP nsCaret::SetCaretReadOnly(PRBool inMakeReadonly)
{
mReadOnly = inMakeReadonly;
return NS_OK;
}
//-----------------------------------------------------------------------------
NS_IMETHODIMP nsCaret::GetCaretCoordinates(EViewCoordinates aRelativeToType, nsISelection *aDOMSel, nsRect *outCoordinates, PRBool *outIsCollapsed)
{
if (!mPresShell)
return NS_ERROR_NOT_INITIALIZED;
if (!outCoordinates || !outIsCollapsed)
return NS_ERROR_NULL_POINTER;
nsCOMPtr<nsISelection> domSelection = aDOMSel;
nsCOMPtr<nsISelectionPrivate> privateSelection(do_QueryInterface(domSelection));
nsresult err;
if (!domSelection)
return NS_ERROR_NOT_INITIALIZED; // no selection
// fill in defaults for failure
outCoordinates->x = -1;
outCoordinates->y = -1;
outCoordinates->width = -1;
outCoordinates->height = -1;
*outIsCollapsed = PR_FALSE;
err = domSelection->GetIsCollapsed(outIsCollapsed);
if (NS_FAILED(err))
return err;
nsCOMPtr<nsIDOMNode> focusNode;
err = domSelection->GetFocusNode(getter_AddRefs(focusNode));
if (NS_FAILED(err))
return err;
if (!focusNode)
return NS_ERROR_FAILURE;
PRInt32 focusOffset;
err = domSelection->GetFocusOffset(&focusOffset);
if (NS_FAILED(err))
return err;
/*
// is this a text node?
nsCOMPtr<nsIDOMCharacterData> nodeAsText = do_QueryInterface(focusNode);
// note that we only work with text nodes here, unlike when drawing the caret.
// this is because this routine is intended for IME support, which only cares about text.
if (!nodeAsText)
return NS_ERROR_UNEXPECTED;
*/
nsCOMPtr<nsIContent>contentNode = do_QueryInterface(focusNode);
if (!contentNode)
return NS_ERROR_FAILURE;
//get frame selection and find out what frame to use...
nsCOMPtr<nsIFrameSelection> frameSelection;
nsCOMPtr<nsIPresShell> presShell = do_QueryReferent(mPresShell);
if (presShell)
err = presShell->GetFrameSelection(getter_AddRefs(frameSelection));
else
return NS_ERROR_FAILURE;
if (NS_FAILED(err) || !frameSelection)
return err?err : NS_ERROR_FAILURE;
// find the frame that contains the content node that has focus
nsIFrame* theFrame = nsnull;
PRInt32 theFrameOffset = 0;
PRBool hintRight;
privateSelection->GetInterlinePosition(&hintRight);//translate hint.
nsIFrameSelection::HINT hint;
if (hintRight)
hint = nsIFrameSelection::HINTRIGHT;
else
hint = nsIFrameSelection::HINTLEFT;
err = frameSelection->GetFrameForNodeOffset(contentNode, focusOffset, hint, &theFrame, &theFrameOffset);
if (NS_FAILED(err) || !theFrame)
return err;
nsPoint viewOffset(0, 0);
nsRect clipRect;
nsIView *drawingView; // views are not refcounted
//#59405, on windows and unix, the coordinate for IME need to be view (nearest native window) related.
if (aRelativeToType == eIMECoordinates)
#ifdef XP_MAC
aRelativeToType = eTopLevelWindowCoordinates;
#else
aRelativeToType = eRenderingViewCoordinates;
#endif
GetViewForRendering(theFrame, aRelativeToType, viewOffset, clipRect, drawingView);
if (!drawingView)
return NS_ERROR_UNEXPECTED;
// ramp up to make a rendering context for measuring text.
// First, we get the pres context ...
nsCOMPtr<nsIPresContext> presContext;
err = presShell->GetPresContext(getter_AddRefs(presContext));
if (NS_FAILED(err))
return err;
// ... then get a device context
nsCOMPtr<nsIDeviceContext> dx;
err = presContext->GetDeviceContext(getter_AddRefs(dx));
if (NS_FAILED(err))
return err;
if (!dx)
return NS_ERROR_UNEXPECTED;
// ... then tell it to make a rendering context
nsCOMPtr<nsIRenderingContext> rendContext;
err = dx->CreateRenderingContext(drawingView, *getter_AddRefs(rendContext));
if (NS_FAILED(err))
return err;
if (!rendContext)
return NS_ERROR_UNEXPECTED;
// now we can measure the offset into the frame.
nsPoint framePos(0, 0);
theFrame->GetPointFromOffset(presContext, rendContext, theFrameOffset, &framePos);
nsRect frameRect;
theFrame->GetRect(frameRect);
// we don't need drawingView anymore so reuse that; reset viewOffset values for our purposes
if (aRelativeToType == eClosestViewCoordinates)
theFrame->GetOffsetFromView(presContext, viewOffset, &drawingView);
// now add the frame offset to the view offset, and we're done
viewOffset += framePos;
outCoordinates->x = viewOffset.x;
outCoordinates->y = viewOffset.y;
outCoordinates->height = frameRect.height;
outCoordinates->width = frameRect.width;
return NS_OK;
}
//-----------------------------------------------------------------------------
NS_IMETHODIMP nsCaret::ClearFrameRefs(nsIFrame* aFrame)
{
if (mLastCaretFrame == aFrame)
{
mLastCaretFrame = nsnull; // frames are not refcounted.
mLastCaretView = nsnull;
mLastContentOffset = 0;
}
mDrawn = PR_FALSE; // assume that the view has been cleared, and ensure
// that we don't try to use the frame.
// should we just call StopBlinking() here?
return NS_OK;
}
NS_IMETHODIMP nsCaret::EraseCaret()
{
if (mDrawn)
DrawCaret();
return NS_OK;
}
#ifdef XP_MAC
#pragma mark -
#endif
//-----------------------------------------------------------------------------
NS_IMETHODIMP nsCaret::NotifySelectionChanged(nsIDOMDocument *, nsISelection *aDomSel, short aReason)
{
if (aReason & nsISelectionListener::MOUSEUP_REASON)//this wont do
return NS_OK;
if (mVisible)
StopBlinking();
nsCOMPtr<nsISelection> domSel(do_QueryReferent(mDomSelectionWeak));
if (domSel.get() != aDomSel)
return NS_OK; //ignore this then.
if (mVisible)
StartBlinking();
return NS_OK;
}
#ifdef XP_MAC
#pragma mark -
#endif
//-----------------------------------------------------------------------------
void nsCaret::KillTimer()
{
if (mBlinkTimer)
{
mBlinkTimer->Cancel();
}
}
//-----------------------------------------------------------------------------
nsresult nsCaret::PrimeTimer()
{
KillTimer();
// set up the blink timer
if (!mReadOnly && mBlinkRate > 0)
{
nsresult err;
mBlinkTimer = do_CreateInstance("@mozilla.org/timer;1", &err);
if (NS_FAILED(err))
return err;
mBlinkTimer->Init(CaretBlinkCallback, this, mBlinkRate, NS_PRIORITY_HIGH, NS_TYPE_REPEATING_PRECISE);
}
return NS_OK;
}
//-----------------------------------------------------------------------------
nsresult nsCaret::StartBlinking()
{
PrimeTimer();
//NS_ASSERTION(!mDrawn, "Caret should not be drawn here");
DrawCaret(); // draw it right away
return NS_OK;
}
//-----------------------------------------------------------------------------
nsresult nsCaret::StopBlinking()
{
if (mDrawn) // erase the caret if necessary
DrawCaret();
KillTimer();
return NS_OK;
}
//-----------------------------------------------------------------------------
// Get the nsIFrame and the content offset for the current caret position.
// Returns PR_TRUE if we should go ahead and draw, PR_FALSE otherwise.
//
PRBool nsCaret::SetupDrawingFrameAndOffset()
{
if (!mDomSelectionWeak)
return PR_FALSE;
nsCOMPtr<nsISelection> domSelection = do_QueryReferent(mDomSelectionWeak);
nsCOMPtr<nsISelectionPrivate> privateSelection(do_QueryInterface(domSelection));
if (!domSelection) return PR_FALSE;
PRBool isCollapsed = PR_FALSE;
domSelection->GetIsCollapsed(&isCollapsed);
if (!mShowDuringSelection && !isCollapsed) return PR_FALSE;
// start and end parent should be the same since we are collapsed
nsCOMPtr<nsIDOMNode> focusNode;
domSelection->GetFocusNode(getter_AddRefs(focusNode));
if (!focusNode) return PR_FALSE;
PRInt32 contentOffset;
if (NS_FAILED(domSelection->GetFocusOffset(&contentOffset)))
return PR_FALSE;
nsCOMPtr<nsIContent> contentNode = do_QueryInterface(focusNode);
if (!contentNode) return PR_FALSE;
//get frame selection and find out what frame to use...
nsCOMPtr<nsIPresShell> presShell = do_QueryReferent(mPresShell);
if (!presShell)
return PR_FALSE;
nsCOMPtr<nsIFrameSelection> frameSelection;
presShell->GetFrameSelection(getter_AddRefs(frameSelection));
if (!frameSelection)
return PR_FALSE;
PRBool hintRight;
privateSelection->GetInterlinePosition(&hintRight);//translate hint.
nsIFrameSelection::HINT hint;
hint = (hintRight) ? nsIFrameSelection::HINTRIGHT : nsIFrameSelection::HINTLEFT;
nsIFrame* theFrame = nsnull;
PRInt32 theFrameOffset = 0;
nsresult rv = frameSelection->GetFrameForNodeOffset(contentNode, contentOffset, hint, &theFrame, &theFrameOffset);
if (NS_FAILED(rv) || !theFrame)
return PR_FALSE;
// now we have a frame, check whether it's appropriate to show the caret here
const nsStyleUserInterface* userinterface;
theFrame->GetStyleData(eStyleStruct_UserInterface, (const nsStyleStruct*&)userinterface);
if (userinterface)
{
if (
#ifdef SUPPORT_USER_MODIFY
// editable content still defaults to NS_STYLE_USER_MODIFY_READ_ONLY at present. See bug 15284
(userinterface->mUserModify == NS_STYLE_USER_MODIFY_READ_ONLY) ||
#endif
(userinterface->mUserInput == NS_STYLE_USER_INPUT_NONE) ||
(userinterface->mUserInput == NS_STYLE_USER_INPUT_DISABLED))
{
return PR_FALSE;
}
}
// mark the frame, so we get notified on deletion.
// frames are never unmarked, which means that we'll touch every frame we visit.
// this is not ideal.
nsFrameState frameState;
theFrame->GetFrameState(&frameState);
frameState |= NS_FRAME_EXTERNAL_REFERENCE;
theFrame->SetFrameState(frameState);
#ifdef IBMBIDI
PRUint8 bidiLevel=0;
// Mamdouh : modification of the caret to work at rtl and ltr with Bidi
const nsStyleVisibility* vis;
theFrame->GetStyleData(eStyleStruct_Visibility, (const nsStyleStruct*&) vis);
//
// Direction Style from this->GetStyleData()
// now in (visibility->mDirection)
// ------------------
// NS_STYLE_DIRECTION_LTR : LTR or Default
// NS_STYLE_DIRECTION_RTL
// NS_STYLE_DIRECTION_INHERIT
nsCOMPtr<nsIPresContext> presContext;
rv = presShell->GetPresContext(getter_AddRefs(presContext));
PRBool bidiEnabled = PR_FALSE;
if (presContext)
presContext->GetBidiEnabled(&bidiEnabled);
if (bidiEnabled)
{
presShell->GetCursorBidiLevel(&bidiLevel);
if (bidiLevel & BIDI_LEVEL_UNDEFINED)
{
PRUint8 newBidiLevel;
bidiLevel &= ~BIDI_LEVEL_UNDEFINED;
// There has been a reflow, so we reset the cursor Bidi level to the level of the current frame
if (!presContext) // Use the style default or default to 0
newBidiLevel = (vis) ? vis->mDirection : 0;
else
{
theFrame->GetBidiProperty(presContext, nsLayoutAtoms::embeddingLevel,
(void**)&newBidiLevel, sizeof(PRUint8) );
presShell->SetCursorBidiLevel(newBidiLevel);
bidiLevel = newBidiLevel;
}
}
PRInt32 start;
PRInt32 end;
nsIFrame* frameBefore;
nsIFrame* frameAfter;
PRUint8 levelBefore; // Bidi level of the character before the caret
PRUint8 levelAfter; // Bidi level of the character after the caret
theFrame->GetOffsets(start, end);
if (start == 0 || end == 0 || start == theFrameOffset || end == theFrameOffset)
{
/* Boundary condition, we need to know the Bidi levels of the characters before and after the cursor */
if (NS_SUCCEEDED(frameSelection->GetPrevNextBidiLevels(presContext, contentNode, contentOffset,
&frameBefore, &frameAfter,
&levelBefore, &levelAfter)))
{
if ((levelBefore != levelAfter) || (bidiLevel != levelBefore))
{
bidiLevel = PR_MAX(bidiLevel, PR_MIN(levelBefore, levelAfter)); // rule c3
bidiLevel = PR_MIN(bidiLevel, PR_MAX(levelBefore, levelAfter)); // rule c4
if (bidiLevel == levelBefore // rule c1
|| bidiLevel > levelBefore && bidiLevel < levelAfter && !((bidiLevel ^ levelBefore) & 1) // rule c5
|| bidiLevel < levelBefore && bidiLevel > levelAfter && !((bidiLevel ^ levelBefore) & 1)) // rule c9
{
if (theFrame != frameBefore)
{
if (frameBefore) // if there is a frameBefore, move into it, setting HINTLEFT to make sure we stay there
{
theFrame = frameBefore;
theFrame->GetOffsets(start, end);
theFrameOffset = end;
// frameSelection->SetHint(nsIFrameSelection::HINTLEFT);
}
else
{
// if there is no frameBefore, we must be at the beginning of the line
// so we stay with the current frame.
// Exception: when the first frame on the line has a different Bidi level from the paragraph level, there is no
// real frame for the caret to be in. We have to find the first frame whose level is the same as the
// paragraph level, and put the caret at the end of the frame before that.
PRUint8 baseLevel;
frameAfter->GetBidiProperty(presContext, nsLayoutAtoms::baseLevel,
(void**)&baseLevel, sizeof(PRUint8) );
if (baseLevel != levelAfter)
{
if (NS_SUCCEEDED(frameSelection->GetFrameFromLevel(presContext, frameAfter, eDirNext, baseLevel, &theFrame)))
{
theFrame->GetOffsets(start, end);
theFrame->GetBidiProperty(presContext, nsLayoutAtoms::embeddingLevel,
(void**)&levelAfter, sizeof(PRUint8) );
if (baseLevel & 1) // RTL paragraph: caret to the right of the rightmost character
theFrameOffset = (levelAfter & 1) ? start : end;
else // LTR paragraph: caret to the left of the leftmost character
theFrameOffset = (levelAfter & 1) ? end : start;
}
}
}
}
}
else if (bidiLevel == levelAfter // rule c2
|| bidiLevel > levelBefore && bidiLevel < levelAfter && !((bidiLevel ^ levelAfter) & 1) // rule c6
|| bidiLevel < levelBefore && bidiLevel > levelAfter && !((bidiLevel ^ levelAfter) & 1)) // rule c10
{
if (theFrame != frameAfter)
{
if (frameAfter)
{
// if there is a frameAfter, move into it, setting HINTRIGHT to make sure we stay there
theFrame = frameAfter;
theFrame->GetOffsets(start, end);
theFrameOffset = start;
// frameSelection->SetHint(nsIFrameSelection::HINTRIGHT);
}
else
{
// if there is no frameAfter, we must be at the end of the line
// so we stay with the current frame.
//
// Exception: when the last frame on the line has a different Bidi level from the paragraph level, there is no
// real frame for the caret to be in. We have to find the last frame whose level is the same as the
// paragraph level, and put the caret at the end of the frame after that.
PRUint8 baseLevel;
frameBefore->GetBidiProperty(presContext, nsLayoutAtoms::baseLevel,
(void**)&baseLevel, sizeof(PRUint8) );
if (baseLevel != levelBefore)
{
if (NS_SUCCEEDED(frameSelection->GetFrameFromLevel(presContext, frameBefore, eDirPrevious, baseLevel, &theFrame)))
{
theFrame->GetOffsets(start, end);
theFrame->GetBidiProperty(presContext, nsLayoutAtoms::embeddingLevel,
(void**)&levelBefore, sizeof(PRUint8) );
if (baseLevel & 1) // RTL paragraph: caret to the left of the leftmost character
theFrameOffset = (levelBefore & 1) ? end : start;
else // RTL paragraph: caret to the right of the rightmost character
theFrameOffset = (levelBefore & 1) ? start : end;
}
}
}
}
}
else if (bidiLevel > levelBefore && bidiLevel < levelAfter // rule c7/8
&& !((levelBefore ^ levelAfter) & 1) // before and after have the same parity
&& ((bidiLevel ^ levelAfter) & 1)) // cursor has different parity
{
if (NS_SUCCEEDED(frameSelection->GetFrameFromLevel(presContext, frameAfter, eDirNext, bidiLevel, &theFrame)))
{
theFrame->GetOffsets(start, end);
theFrame->GetBidiProperty(presContext, nsLayoutAtoms::embeddingLevel,
(void**)&levelAfter, sizeof(PRUint8) );
if (bidiLevel & 1) // c8: caret to the right of the rightmost character
theFrameOffset = (levelAfter & 1) ? start : end;
else // c7: caret to the left of the leftmost character
theFrameOffset = (levelAfter & 1) ? end : start;
}
}
else if (bidiLevel < levelBefore && bidiLevel > levelAfter // rule c11/12
&& !((levelBefore ^ levelAfter) & 1) // before and after have the same parity
&& ((bidiLevel ^ levelAfter) & 1)) // cursor has different parity
{
if (NS_SUCCEEDED(frameSelection->GetFrameFromLevel(presContext, frameBefore, eDirPrevious, bidiLevel, &theFrame)))
{
theFrame->GetOffsets(start, end);
theFrame->GetBidiProperty(presContext, nsLayoutAtoms::embeddingLevel,
(void**)&levelBefore, sizeof(PRUint8) );
if (bidiLevel & 1) // c12: caret to the left of the leftmost character
theFrameOffset = (levelBefore & 1) ? end : start;
else // c11: caret to the right of the rightmost character
theFrameOffset = (levelBefore & 1) ? start : end;
}
}
}
}
}
}
#endif // IBMBIDI
mLastCaretFrame = theFrame;
mLastContentOffset = theFrameOffset;
return PR_TRUE;
}
//-----------------------------------------------------------------------------
void nsCaret::GetViewForRendering(nsIFrame *caretFrame, EViewCoordinates coordType, nsPoint &viewOffset, nsRect& outClipRect, nsIView* &outView)
{
outView = nsnull;
if (!caretFrame)
return;
NS_ASSERTION(caretFrame, "Should have frame here");
nsCOMPtr<nsIPresShell> presShell = do_QueryReferent(mPresShell);
if (!presShell)
return;
nsCOMPtr<nsIPresContext> presContext;
presShell->GetPresContext(getter_AddRefs(presContext));
viewOffset.x = 0;
viewOffset.y = 0;
nsPoint withinViewOffset(0, 0);
// get the offset of this frame from its parent view (walks up frame hierarchy)
nsIView* theView = nsnull;
caretFrame->GetOffsetFromView(presContext, withinViewOffset, &theView);
if (theView == nsnull) return;
nsIView* returnView = nsnull; // views are not refcounted
nscoord x, y;
// coorinates relative to the view we are going to use for drawing
if (coordType == eRenderingViewCoordinates)
{
nsIScrollableView* scrollableView = nsnull;
nsPoint drawViewOffset(0, 0); // offset to the view we are using to draw
// walk up to the first view with a widget
do {
theView->GetPosition(&x, &y);
//is this a scrollable view?
if (!scrollableView)
theView->QueryInterface(NS_GET_IID(nsIScrollableView), (void **)&scrollableView);
PRBool hasWidget;
theView->HasWidget(&hasWidget);
if (hasWidget)
{
returnView = theView;
break;
}
drawViewOffset.x += x;
drawViewOffset.y += y;
theView->GetParent(theView);
} while (theView);
viewOffset = withinViewOffset;
viewOffset += drawViewOffset;
if (scrollableView)
{
const nsIView* clipView = nsnull;
scrollableView->GetClipView(&clipView);
if (!clipView) return; // should always have one
nsRect bounds;
clipView->GetBounds(bounds);
scrollableView->GetScrollPosition(bounds.x, bounds.y);
bounds += drawViewOffset; // offset to coords of returned view
outClipRect = bounds;
}
else
{
returnView->GetBounds(outClipRect);
}
}
else
{
// window-relative coordinates (walk right to the top of the view hierarchy)
// we don't do anything with clipping here
viewOffset = withinViewOffset;
do {
theView->GetPosition(&x, &y);
if (!returnView)
{
PRBool hasWidget;
theView->HasWidget(&hasWidget);
if (hasWidget)
returnView = theView;
}
// is this right?
viewOffset.x += x;
viewOffset.y += y;
theView->GetParent(theView);
} while (theView);
}
outView = returnView;
}
/*-----------------------------------------------------------------------------
MustDrawCaret
FInd out if we need to do any caret drawing. This returns true if
either a) or b)
a) caret has been drawn, and we need to erase it.
b) caret is not drawn, and selection is collapsed
----------------------------------------------------------------------------- */
PRBool nsCaret::MustDrawCaret()
{
nsCOMPtr<nsIPresShell> presShell = do_QueryReferent(mPresShell);
if (presShell) {
PRBool isPaintingSuppressed;
presShell->IsPaintingSuppressed(&isPaintingSuppressed);
if (isPaintingSuppressed)
return PR_FALSE;
}
if (mDrawn)
return PR_TRUE;
nsCOMPtr<nsISelection> domSelection = do_QueryReferent(mDomSelectionWeak);
if (!domSelection)
return PR_FALSE;
PRBool isCollapsed;
if (NS_FAILED(domSelection->GetIsCollapsed(&isCollapsed)))
return PR_FALSE;
if (mShowDuringSelection)
return PR_TRUE; // show the caret even in selections
return isCollapsed;
}
/*-----------------------------------------------------------------------------
DrawCaret
----------------------------------------------------------------------------- */
void nsCaret::DrawCaret()
{
// do we need to draw the caret at all?
if (!MustDrawCaret())
return;
// if we are drawing, not erasing, then set up the frame etc.
if (!mDrawn)
{
if (!SetupDrawingFrameAndOffset())
return;
}
NS_ASSERTION(mLastCaretFrame != nsnull, "Should have a frame here");
nsRect frameRect;
mLastCaretFrame->GetRect(frameRect);
frameRect.x = 0; // the origin is accounted for in GetViewForRendering()
frameRect.y = 0;
nsPoint viewOffset(0, 0);
nsRect clipRect;
nsIView *drawingView;
GetViewForRendering(mLastCaretFrame, eRenderingViewCoordinates, viewOffset, clipRect, drawingView);
if (drawingView == nsnull)
return;
frameRect += viewOffset;
nsCOMPtr<nsIPresShell> presShell = do_QueryReferent(mPresShell);
if (!presShell) return;
nsCOMPtr<nsIPresContext> presContext;
if (NS_FAILED(presShell->GetPresContext(getter_AddRefs(presContext))))
return;
// if the view changed, or we don't have a rendering context, make one
// because of drawing issues, always make a new RC at the momemt. See bug 28068
if (
#ifdef DONT_REUSE_RENDERING_CONTEXT
PR_TRUE ||
#endif
(mLastCaretView != drawingView) || !mRendContext)
{
mRendContext = nsnull; // free existing one if we have one
nsCOMPtr<nsIDeviceContext> dx;
if (NS_FAILED(presContext->GetDeviceContext(getter_AddRefs(dx))) || !dx)
return;
if (NS_FAILED(dx->CreateRenderingContext(drawingView, *getter_AddRefs(mRendContext))) || !mRendContext)
return;
}
// push a known good state
mRendContext->PushState();
// if we got a zero-height frame, it's probably a BR frame at the end of a non-empty line
// (see BRFrame::Reflow). In that case, figure out a height. We have to do this
// after we've got an RC.
if (frameRect.height == 0)
{
const nsStyleFont* fontStyle;
mLastCaretFrame->GetStyleData(eStyleStruct_Font, (const nsStyleStruct*&)fontStyle);
mRendContext->SetFont(fontStyle->mFont);
nsCOMPtr<nsIFontMetrics> fm;
mRendContext->GetFontMetrics(*getter_AddRefs(fm));
if (fm)
{
nscoord ascent, descent;
fm->GetMaxAscent(ascent);
fm->GetMaxDescent(descent);
frameRect.height = ascent + descent;
frameRect.y -= ascent; // BR frames sit on the baseline of the text, so we need to subtract
// the ascent to account for the frame height.
}
}
// views are not refcounted
mLastCaretView = drawingView;
if (!mDrawn)
{
nsPoint framePos(0, 0);
nsRect caretRect = frameRect;
mLastCaretFrame->GetPointFromOffset(presContext, mRendContext, mLastContentOffset, &framePos);
caretRect += framePos;
//printf("Content offset %ld, frame offset %ld\n", focusOffset, framePos.x);
if(mCaretTwipsWidth < 0)
{// need to re-compute the pixel width
float tDevUnitsToTwips = 15;
nsCOMPtr<nsIDeviceContext> dx;
presContext->GetDeviceContext(getter_AddRefs(dx));
if (dx)
dx->GetDevUnitsToTwips(tDevUnitsToTwips);
mCaretTwipsWidth = tDevUnitsToTwips * mCaretPixelsWidth;
}
caretRect.width = mCaretTwipsWidth;
// Avoid view redraw problems by making sure the
// caret doesn't hang outside the right edge of
// the frame. This ensures that the caret gets
// erased properly if the frame's right edge gets
// invalidated.
nscoord cX = caretRect.x + caretRect.width;
nscoord fX = frameRect.x + frameRect.width;
if (caretRect.x <= fX && cX > fX)
{
caretRect.x -= cX - fX;
if (caretRect.x < frameRect.x)
caretRect.x = frameRect.x;
}
mCaretRect.IntersectRect(clipRect, caretRect);
#ifdef IBMBIDI
// Simon -- make a hook to draw to the left or right of the caret to show keyboard language direction
PRBool bidiEnabled;
nsRect hookRect;
PRBool bidiLevel=PR_FALSE;
if (mBidiKeyboard)
mBidiKeyboard->IsLangRTL(&bidiLevel);
if (bidiLevel)
{
bidiEnabled = PR_TRUE;
presContext->SetBidiEnabled(bidiEnabled);
}
else
presContext->GetBidiEnabled(&bidiEnabled);
if (bidiEnabled)
{
if (bidiLevel != mKeyboardRTL)
{
/* if the caret bidi level and the keyboard language direction are not in
* synch, the keyboard language must have been changed by the
* user, and if the caret is in a boundary condition (between left-to-right and
* right-to-left characters) it may have to change position to
* reflect the location in which the next character typed will
* appear. We will call |SelectionLanguageChange| and exit
* without drawing the caret in the old position.
*/
mKeyboardRTL = bidiLevel;
nsCOMPtr<nsISelection> domSelection = do_QueryReferent(mDomSelectionWeak);
if (domSelection)
{
if (NS_SUCCEEDED(domSelection->SelectionLanguageChange(mKeyboardRTL)))
{
PRBool emptyClip;
mRendContext->PopState(emptyClip);
return;
}
}
}
// If keyboard language is RTL, draw the hook on the left; if LTR, to the right
hookRect.SetRect(caretRect.x + caretRect.width * ((bidiLevel) ? -1 : 1),
caretRect.y + caretRect.width,
caretRect.width,
caretRect.width);
mHookRect.IntersectRect(clipRect, hookRect);
}
#endif //IBMBIDI
}
if (mReadOnly)
mRendContext->SetColor(NS_RGB(85, 85, 85)); // we are drawing it; gray
else
mRendContext->SetColor(NS_RGB(255,255,255));
mRendContext->InvertRect(mCaretRect);
#ifdef IBMBIDI
if (!mHookRect.IsEmpty()) // if Bidi support is disabled, the rectangle remains empty and won't be drawn
mRendContext->InvertRect(mHookRect);
#endif
PRBool emptyClip; // I know what you're thinking. "Did he fire six shots or only five?"
mRendContext->PopState(emptyClip);
ToggleDrawnStatus();
#ifdef DONT_REUSE_RENDERING_CONTEXT
mRendContext = nsnull;
#endif
}
#ifdef XP_MAC
#pragma mark -
#endif
//-----------------------------------------------------------------------------
/* static */
void nsCaret::CaretBlinkCallback(nsITimer *aTimer, void *aClosure)
{
nsCaret *theCaret = NS_REINTERPRET_CAST(nsCaret*, aClosure);
if (!theCaret) return;
theCaret->DrawCaret();
#ifndef REPEATING_TIMERS
theCaret->PrimeTimer();
#endif
}
//-----------------------------------------------------------------------------
nsresult NS_NewCaret(nsICaret** aInstancePtrResult)
{
NS_PRECONDITION(aInstancePtrResult, "null ptr");
nsCaret* caret = new nsCaret();
if (nsnull == caret)
return NS_ERROR_OUT_OF_MEMORY;
return caret->QueryInterface(NS_GET_IID(nsICaret), (void**) aInstancePtrResult);
}
NS_IMETHODIMP nsCaret::SetCaretWidth(nscoord aPixels)
{
if(!aPixels)
return NS_ERROR_FAILURE;
else
{ //no need to optimize this, but if it gets too slow, we can check for case aPixels==mCaretPixelsWidth
mCaretPixelsWidth = aPixels;
mCaretTwipsWidth = -1;
}
return NS_OK;
}
void nsCaret::SetVisibilityDuringSelection(PRBool aVisibility) {
mShowDuringSelection = aVisibility;
}
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