| /* |
| * Copyright (C) 2011 Igalia S.L. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "config.h" |
| #include "GtkAdjustmentWatcher.h" |
| |
| #include "Frame.h" |
| #include "FrameView.h" |
| #include "Page.h" |
| #include "Scrollbar.h" |
| #include "webkitwebviewprivate.h" |
| #include <gtk/gtk.h> |
| |
| using namespace WebCore; |
| |
| namespace WebKit { |
| |
| GtkAdjustmentWatcher::GtkAdjustmentWatcher(WebKitWebView* webView) |
| : m_webView(webView) |
| , m_scrollbarsDisabled(false) |
| , m_handlingGtkAdjustmentChange(false) |
| , m_updateAdjustmentCallbackId(0) |
| { |
| } |
| |
| GtkAdjustmentWatcher::~GtkAdjustmentWatcher() |
| { |
| if (m_updateAdjustmentCallbackId) |
| g_source_remove(m_updateAdjustmentCallbackId); |
| } |
| |
| static void updateAdjustmentFromScrollbar(GtkAdjustment* adjustment, Scrollbar* scrollbar) |
| { |
| if (!adjustment) |
| return; |
| if (!scrollbar) { |
| gtk_adjustment_configure(adjustment, 0, 0, 0, 0, 0, 0); // These are the settings which remove the scrollbar. |
| return; |
| } |
| gtk_adjustment_configure(adjustment, scrollbar->value(), 0, scrollbar->totalSize(), |
| scrollbar->lineStep(), scrollbar->pageStep(), scrollbar->visibleSize()); |
| } |
| |
| void GtkAdjustmentWatcher::updateAdjustmentsFromScrollbars() |
| { |
| if (m_scrollbarsDisabled) |
| return; |
| if (m_handlingGtkAdjustmentChange) |
| return; |
| if (!core(m_webView) || !core(m_webView)->mainFrame()) |
| return; |
| |
| FrameView* frameView = core(m_webView)->mainFrame()->view(); |
| updateAdjustmentFromScrollbar(m_horizontalAdjustment.get(), frameView->horizontalScrollbar()); |
| updateAdjustmentFromScrollbar(m_verticalAdjustment.get(), frameView->verticalScrollbar()); |
| m_updateAdjustmentCallbackId = 0; |
| } |
| |
| static gboolean updateAdjustmentCallback(GtkAdjustmentWatcher* watcher) |
| { |
| watcher->updateAdjustmentsFromScrollbars(); |
| return FALSE; |
| } |
| |
| void GtkAdjustmentWatcher::updateAdjustmentsFromScrollbarsLater() const |
| { |
| // We've already scheduled an update. No need to schedule another. |
| if (m_updateAdjustmentCallbackId || m_scrollbarsDisabled) |
| return; |
| |
| // The fact that this method was called means that we need to update the scrollbars, but at the |
| // time of invocation they are not updated to reflect the scroll yet. We set a short timeout |
| // here, which means that they will be updated as soon as WebKit returns to the main loop. |
| m_updateAdjustmentCallbackId = g_timeout_add(0, reinterpret_cast<GSourceFunc>(updateAdjustmentCallback), |
| const_cast<void*>(static_cast<const void*>(this))); |
| } |
| |
| static void adjustmentValueChangedCallback(GtkAdjustment* adjustment, GtkAdjustmentWatcher* watcher) |
| { |
| watcher->adjustmentValueChanged(adjustment); |
| } |
| |
| static void setAdjustment(GtkAdjustmentWatcher* watcher, GRefPtr<GtkAdjustment>& adjustmentMember, GtkAdjustment* newAdjustment) |
| { |
| if (adjustmentMember) { |
| g_signal_handlers_disconnect_by_func(adjustmentMember.get(), |
| reinterpret_cast<void*>(adjustmentValueChangedCallback), watcher); |
| } |
| |
| adjustmentMember = newAdjustment; |
| if (newAdjustment) |
| g_signal_connect(newAdjustment, "value-changed", G_CALLBACK(adjustmentValueChangedCallback), watcher); |
| } |
| |
| void GtkAdjustmentWatcher::setHorizontalAdjustment(GtkAdjustment* newAdjustment) |
| { |
| setAdjustment(this, m_horizontalAdjustment, newAdjustment); |
| } |
| |
| void GtkAdjustmentWatcher::setVerticalAdjustment(GtkAdjustment* newAdjustment) |
| { |
| setAdjustment(this, m_verticalAdjustment, newAdjustment); |
| } |
| |
| void GtkAdjustmentWatcher::adjustmentValueChanged(GtkAdjustment* adjustment) |
| { |
| FrameView* frameView = core(m_webView)->mainFrame()->view(); |
| Scrollbar* scrollbar = (adjustment == m_horizontalAdjustment.get()) ? |
| frameView->horizontalScrollbar() : frameView->verticalScrollbar(); |
| if (!scrollbar) |
| return; |
| |
| int newValue = static_cast<int>(gtk_adjustment_get_value(adjustment)); |
| if (newValue != scrollbar->value()) { |
| m_handlingGtkAdjustmentChange = true; |
| frameView->scrollToOffsetWithoutAnimation(scrollbar->orientation(), newValue); |
| m_handlingGtkAdjustmentChange = false; |
| } |
| } |
| |
| void GtkAdjustmentWatcher::disableAllScrollbars() |
| { |
| updateAdjustmentFromScrollbar(m_horizontalAdjustment.get(), 0); |
| updateAdjustmentFromScrollbar(m_verticalAdjustment.get(), 0); |
| m_scrollbarsDisabled = true; |
| } |
| |
| void GtkAdjustmentWatcher::enableAllScrollbars() |
| { |
| m_scrollbarsDisabled = false; |
| updateAdjustmentsFromScrollbars(); |
| } |
| |
| } // namespace WebKit |
| |