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Browser: Add basic back/forward history

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This commit is contained in:
Andreas Kling 2019-10-17 21:25:38 +02:00
parent 340b524c0d
commit 89aaae82a1
2 changed files with 92 additions and 6 deletions
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61
Applications/Browser/History.h Normal file
View file

@ -0,0 +1,61 @@
#pragma once
#include <AK/Optional.h>
#include <AK/String.h>
#include <AK/Vector.h>
template<typename T>
class History final {
public:
void push(const T& item);
T current() const;
void go_back();
void go_forward();
bool can_go_back() { return m_current > 0; }
bool can_go_forward() { return m_current + 1 < m_items.size(); }
void clear();
private:
Vector<T> m_items;
int m_current { -1 };
};
template<typename T>
inline void History<T>::push(const T& item)
{
m_items.shrink(m_current + 1);
m_items.append(item);
m_current++;
}
template<typename T>
inline T History<T>::current() const
{
if (m_current == -1)
return {};
return m_items[m_current];
}
template<typename T>
inline void History<T>::go_back()
{
ASSERT(can_go_back());
m_current--;
}
template<typename T>
inline void History<T>::go_forward()
{
ASSERT(can_go_forward());
m_current++;
}
template<typename T>
inline void History<T>::clear()
{
m_items = {};
m_current = -1;
}

37
Applications/Browser/main.cpp
View file

@ -1,3 +1,4 @@
#include "History.h"
#include <LibCore/CFile.h>
#include <LibGUI/GAboutDialog.h>
#include <LibGUI/GAction.h>
@ -39,13 +40,34 @@ int main(int argc, char** argv)
auto toolbar = GToolBar::construct(widget);
auto html_widget = HtmlView::construct(widget);
toolbar->add_action(GCommonActions::make_go_back_action([&](auto&) {
// FIXME: Implement back action
}));
History<URL> history;
toolbar->add_action(GCommonActions::make_go_forward_action([&](auto&) {
// FIXME: Implement forward action
}));
RefPtr<GAction> go_back_action;
RefPtr<GAction> go_forward_action;
auto update_actions = [&]() {
go_back_action->set_enabled(history.can_go_back());
go_forward_action->set_enabled(history.can_go_forward());
};
bool should_push_loads_to_history = true;
go_back_action = GCommonActions::make_go_back_action([&](auto&) {
history.go_back();
update_actions();
TemporaryChange<bool> change(should_push_loads_to_history, false);
html_widget->load(history.current());
});
go_forward_action = GCommonActions::make_go_forward_action([&](auto&) {
history.go_forward();
update_actions();
TemporaryChange<bool> change(should_push_loads_to_history, false);
html_widget->load(history.current());
});
toolbar->add_action(*go_back_action);
toolbar->add_action(*go_forward_action);
toolbar->add_action(GCommonActions::make_go_home_action([&](auto&) {
html_widget->load(home_url);
@ -63,6 +85,9 @@ int main(int argc, char** argv)
html_widget->on_load_start = [&](auto& url) {
location_box->set_text(url.to_string());
if (should_push_loads_to_history)
history.push(url);
update_actions();
};
html_widget->on_link_click = [&](auto& url) {