pjs/chimera/CHGoMenu.mm

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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 Mozilla 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/MPL/
*
* 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 the Mozilla browser.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 2002 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
* Joe Hewitt <hewitt@netscape.com> (Original Author)
*/
#import "CHGoMenu.h"
#import "BrowserWindowController.h"
#import "CHBrowserWrapper.h"
#import "CHBrowserView.h"
#include "nsCOMPtr.h"
#include "nsString.h"
#include "nsIWebBrowser.h"
#include "nsISHistory.h"
#include "nsIWebNavigation.h"
#include "nsIHistoryEntry.h"
#include "nsCRT.h"
// the tag of the separator after which to insert history menu items
static const int kDividerTag = 4000;
// the maximum number of history entry menuitems to display
static const int kMaxItems = 15;
// the maximum number of characters in a menu title before cropping it
static const int kMaxTitleLength = 20;
@implementation CHGoMenu
- (void) update
{
[self emptyHistoryItems];
[self addHistoryItems];
[super update];
}
- (nsIWebNavigation*) currentWebNavigation
{
// get controller for current window
BrowserWindowController *controller;
controller = (BrowserWindowController*)[[NSApp mainWindow] windowController];
if (!controller) return nsnull;
// get web navigation for current browser
CHBrowserWrapper* wrapper = [controller getBrowserWrapper];
if (!wrapper) return nsnull;
CHBrowserView* view = [wrapper getBrowserView];
if (!view) return nsnull;
nsCOMPtr<nsIWebBrowser> webBrowser = [view getWebBrowser];
if (!webBrowser) return nsnull;
nsCOMPtr<nsIWebNavigation> webNav(do_QueryInterface(webBrowser));
return webNav.get();
}
- (void) historyItemAction:(id)sender
{
// get web navigation for current browser
nsCOMPtr<nsIWebNavigation> webNav = [self currentWebNavigation];
if (!webNav) return;
// browse to the history entry for the menuitem that was selected
PRInt32 historyIndex = ([sender tag] - 1) - kDividerTag;
webNav->GotoIndex(historyIndex);
}
- (void) emptyHistoryItems
{
// remove every history item after the insertion point
int insertionIndex = [self indexOfItemWithTag:kDividerTag];
for (int i = [self numberOfItems]-1; i > insertionIndex ; --i) {
[self removeItemAtIndex:i];
}
}
- (void) addHistoryItems
{
// get session history for current browser
nsCOMPtr<nsIWebNavigation> webNav = [self currentWebNavigation];
if (!webNav) return;
nsCOMPtr<nsISHistory> sessionHistory;
webNav->GetSessionHistory(getter_AddRefs(sessionHistory));
PRInt32 count;
sessionHistory->GetCount(&count);
PRInt32 currentIndex;
sessionHistory->GetIndex(&currentIndex);
// determine the range of items to display
int rangeStart, rangeEnd;
int above = kMaxItems/2;
int below = (kMaxItems-above)-1;
if (count <= kMaxItems) {
// if the whole history fits within our menu, fit range to show all
rangeStart = count-1;
rangeEnd = 0;
} else {
// if the whole history is too large for menu, try to put current index as close to
// the middle of the list as possible, so the user can see both back and forward in session
rangeStart = currentIndex + above;
rangeEnd = currentIndex - below;
if (rangeStart >= count-1) {
rangeEnd -= (rangeStart-count)+1; // shift overflow to the end
rangeStart = count-1;
} else if (rangeEnd < 0) {
rangeStart -= rangeEnd; // shift overflow to the start
rangeEnd = 0;
}
}
// create a new menu item for each history entry (up to MAX_MENUITEM entries)
for (PRInt32 i = rangeStart; i >= rangeEnd; --i) {
nsCOMPtr<nsIHistoryEntry> entry;
sessionHistory->GetEntryAtIndex(i, PR_FALSE, getter_AddRefs(entry));
PRUnichar *text;
entry->GetTitle(&text);
NSString* title = [NSString stringWithCharacters: text length: nsCRT::strlen(text)];
if ([title length] > kMaxTitleLength) {
}
NSMenuItem *newItem = [self addItemWithTitle:title action:@selector(historyItemAction:) keyEquivalent:@""];
[newItem setTarget:self];
[newItem setTag:kDividerTag+1+i];
if (currentIndex == i)
[newItem setState:NSOnState];
}
}
@end