зеркало из https://github.com/mozilla/gecko-dev.git
135 строки
3.5 KiB
C++
135 строки
3.5 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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#include "CKeyScrollAttachment.h"
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CKeyScrollAttachment::CKeyScrollAttachment(LStream* inStream)
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: LAttachment(inStream)
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{
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mViewToScroll = dynamic_cast<LView*>(GetOwnerHost());
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ThrowIfNULL_(mViewToScroll);
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Assert_(mMessage == msg_KeyPress);
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}
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void
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CKeyScrollAttachment::ExecuteSelf(
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MessageT /* inMessage */,
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void *ioParam)
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{
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mExecuteHost = false; // We handle navigation keys
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Int16 theKey = ((EventRecord*) ioParam)->message & charCodeMask;
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switch (theKey)
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{
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case char_Home: // Scroll to top left
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mViewToScroll->ScrollImageTo(0, 0, true);
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break;
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case char_End:
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{ // Scroll to bottom right
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SDimension16 frameSize;
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SDimension32 imageSize;
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mViewToScroll->GetFrameSize(frameSize);
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mViewToScroll->GetImageSize(imageSize);
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// Obviously we don't want to scroll a small image to the bottom of
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// the frame...
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SInt16 deltaV = imageSize.height - frameSize.height;
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if (deltaV < 0)
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deltaV = 0;
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SInt16 deltaH = imageSize.width - frameSize.width;
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if (deltaH < 0)
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deltaH = 0;
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if (deltaV || deltaH)
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mViewToScroll->ScrollImageTo(deltaH, deltaV, true);
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}
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break;
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case char_PageUp:
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{ // Scroll up by height of Frame,
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// but not past top of Image
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SPoint32 frameLoc;
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SPoint32 imageLoc;
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mViewToScroll->GetFrameLocation(frameLoc);
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mViewToScroll->GetImageLocation(imageLoc);
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Int32 upMax = frameLoc.v - imageLoc.v;
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if (upMax > 0)
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{
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SPoint32 scrollUnit;
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SDimension16 frameSize;
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mViewToScroll->GetScrollUnit(scrollUnit);
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mViewToScroll->GetFrameSize(frameSize);
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Int32 up = (frameSize.height - 1) / scrollUnit.v;
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if (up <= 0)
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up = 1;
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up *= scrollUnit.v;
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if (up > upMax)
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up = upMax;
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mViewToScroll->ScrollImageBy(0, -up, true);
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}
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}
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break;
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case char_PageDown:
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{ // Scroll down by height of Frame,
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// but not past bottom of Image
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SPoint32 frameLoc;
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SPoint32 imageLoc;
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SDimension16 frameSize;
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SDimension32 imageSize;
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mViewToScroll->GetFrameLocation(frameLoc);
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mViewToScroll->GetImageLocation(imageLoc);
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mViewToScroll->GetFrameSize(frameSize);
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mViewToScroll->GetImageSize(imageSize);
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Int32 downMax = imageSize.height - frameSize.height -
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(frameLoc.v - imageLoc.v);
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if (downMax > 0) {
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SPoint32 scrollUnit;
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mViewToScroll->GetScrollUnit(scrollUnit);
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Int32 down = (frameSize.height - 1) / scrollUnit.v;
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if (down <= 0) {
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down = 1;
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}
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down *= scrollUnit.v;
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if (down > downMax) {
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down = downMax;
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}
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mViewToScroll->ScrollImageBy(0, down, true);
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}
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break;
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}
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default:
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mExecuteHost = true; // Some other key, let host respond
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break;
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}
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}
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