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genode/repos/gems/src/server/wm/nitpicker.h

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/*
* \brief Virtualized nitpicker service announced to the outside world
* \author Norman Feske
* \date 2014-02-14
*/
/*
* Copyright (C) 2014 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _NITPICKER_H_
#define _NITPICKER_H_
/* Genode includes */
#include <util/list.h>
#include <base/tslab.h>
#include <os/server.h>
#include <os/surface.h>
#include <os/attached_ram_dataspace.h>
#include <os/session_policy.h>
#include <os/reporter.h>
#include <os/session_policy.h>
#include <cap_session/connection.h>
#include <root/component.h>
#include <nitpicker_session/connection.h>
#include <input_session/capability.h>
#include <input/component.h>
/* local includes */
#include <window_registry.h>
#include <decorator_nitpicker.h>
#include <layouter_nitpicker.h>
#include <direct_nitpicker.h>
namespace Wm {
using Genode::Rpc_object;
using Genode::List;
using Genode::Allocator;
using Genode::Affinity;
using Genode::static_cap_cast;
using Genode::Signal_rpc_member;
using Genode::Ram_session_capability;
using Genode::Weak_ptr;
using Genode::Locked_ptr;
using Genode::Tslab;
using Genode::Attached_ram_dataspace;
using Genode::Signal_context_capability;
using Genode::Signal_transmitter;
using Genode::Reporter;
using Genode::Capability;
}
namespace Wm { namespace Nitpicker {
using namespace ::Nitpicker;
class Click_handler;
class View_handle_ctx;
class View;
class Top_level_view;
class Child_view;
class Session_control_fn;
class Session_component;
class Root;
typedef Genode::Surface_base::Rect Rect;
typedef Genode::Surface_base::Point Point;
typedef Genode::Session_label Session_label;
} }
/**
* Interface used for propagating clicks into unfocused windows to the layouter
*
* The click handler is invoked only for those click events that are of
* interest to the layouter. In particular, a click into an unfocused window
* may trigger the layouter to raise the window and change the focus. However,
* clicks into an already focused window should be of no interest to the
* layouter. So we hide them from the layouter.
*/
struct Wm::Nitpicker::Click_handler
{
virtual void handle_click(Point pos) = 0;
virtual void handle_enter(Point pos) = 0;
};
struct Nitpicker::View { GENODE_RPC_INTERFACE(); };
class Wm::Nitpicker::View : public Genode::Weak_object<View>,
public Genode::Rpc_object< ::Nitpicker::View>
{
protected:
typedef Genode::String<100> Title;
typedef Nitpicker::Session::Command Command;
typedef Nitpicker::Session::View_handle View_handle;
Session_label _session_label;
Nitpicker::Session_client &_real_nitpicker;
View_handle _real_handle;
Title _title;
Rect _geometry;
Point _buffer_offset;
Weak_ptr<View> _neighbor_ptr;
bool _neighbor_behind;
bool _has_alpha;
View(Nitpicker::Session_client &real_nitpicker,
Session_label const &session_label,
bool has_alpha)
:
_session_label(session_label), _real_nitpicker(real_nitpicker),
_has_alpha(has_alpha)
{ }
/**
* Propagate cached view geometry to the physical nitpicker view
*/
virtual void _propagate_view_geometry() = 0;
/**
* Apply cached view state to the physical nitpicker view
*/
void _apply_view_config()
{
if (!_real_handle.valid())
return;
_propagate_view_geometry();
_real_nitpicker.enqueue<Command::Offset>(_real_handle, _buffer_offset);
_real_nitpicker.enqueue<Command::Title> (_real_handle, _title.string());
View_handle real_neighbor_handle;
Locked_ptr<View> neighbor(_neighbor_ptr);
if (neighbor.is_valid())
real_neighbor_handle = _real_nitpicker.view_handle(neighbor->real_view_cap());
if (_neighbor_behind)
_real_nitpicker.enqueue<Command::To_front>(_real_handle, real_neighbor_handle);
else
_real_nitpicker.enqueue<Command::To_back>(_real_handle, real_neighbor_handle);
_real_nitpicker.execute();
if (real_neighbor_handle.valid())
_real_nitpicker.release_view_handle(real_neighbor_handle);
}
public:
~View()
{
if (_real_handle.valid())
_real_nitpicker.destroy_view(_real_handle);
}
Point virtual_position() const { return _geometry.p1(); }
virtual bool belongs_to_win_id(Window_registry::Id id) const = 0;
virtual void geometry(Rect geometry)
{
_geometry = geometry;
/*
* Propagate new size to real nitpicker view but
*/
if (_real_handle.valid()) {
_propagate_view_geometry();
_real_nitpicker.execute();
}
}
virtual void title(char const *title)
{
_title = Title(title);
if (_real_handle.valid()) {
_real_nitpicker.enqueue<Command::Title>(_real_handle, title);
_real_nitpicker.execute();
}
}
virtual Point input_anchor_position() const = 0;
virtual void stack(Weak_ptr<View> neighbor_ptr, bool behind) { }
View_handle real_handle() const { return _real_handle; }
View_capability real_view_cap()
{
return _real_nitpicker.view_capability(_real_handle);
}
void buffer_offset(Point buffer_offset)
{
_buffer_offset = buffer_offset;
if (_real_handle.valid()) {
_real_nitpicker.enqueue<Command::Offset>(_real_handle, _buffer_offset);
_real_nitpicker.execute();
}
}
bool has_alpha() const { return _has_alpha; }
};
class Wm::Nitpicker::Top_level_view : public View,
public List<Top_level_view>::Element
{
private:
Window_registry::Id _win_id;
Window_registry &_window_registry;
/*
* Geometry of window-content view, which corresponds to the location
* of the window content as known by the decorator.
*/
Rect _content_geometry;
bool _resizeable = false;
Title _window_title;
Session_label _session_label;
typedef Nitpicker::Session::Command Command;
public:
Top_level_view(Nitpicker::Session_client &real_nitpicker,
Session_label const &session_label,
bool has_alpha,
Window_registry &window_registry)
:
View(real_nitpicker, session_label, has_alpha),
_window_registry(window_registry),
_session_label(session_label)
{ }
~Top_level_view()
{
if (_win_id.valid())
_window_registry.destroy(_win_id);
View::lock_for_destruction();
}
void _propagate_view_geometry() override { }
void geometry(Rect geometry) override
{
/*
* Add window to the window-list model on the first call. We
* defer the creation of the window ID until the time when the
* initial geometry is known.
*/
if (!_win_id.valid()) {
_win_id = _window_registry.create();
_window_registry.title(_win_id, _window_title.string());
_window_registry.label(_win_id, _session_label);
_window_registry.has_alpha(_win_id, View::has_alpha());
_window_registry.resizeable(_win_id, _resizeable);
}
_window_registry.size(_win_id, geometry.area());
View::geometry(geometry);
}
Area size() const { return _geometry.area(); }
void title(char const *title) override
{
View::title(title);
_window_title = Title(title);
if (_win_id.valid())
_window_registry.title(_win_id, _window_title.string());
}
bool has_win_id(Window_registry::Id id) const { return id == _win_id; }
bool belongs_to_win_id(Window_registry::Id id) const override
{
return has_win_id(id);
}
Point input_anchor_position() const override
{
return _content_geometry.p1();
}
void content_geometry(Rect rect) { _content_geometry = rect; }
View_capability content_view()
{
if (!_real_handle.valid()) {
/*
* Create and configure physical nitpicker view.
*/
_real_handle = _real_nitpicker.create_view();
_real_nitpicker.enqueue<Command::Offset>(_real_handle, _buffer_offset);
_real_nitpicker.enqueue<Command::Title> (_real_handle, _title.string());
_real_nitpicker.execute();
}
return _real_nitpicker.view_capability(_real_handle);
}
void is_hidden(bool is_hidden) { _window_registry.is_hidden(_win_id, is_hidden); }
void resizeable(bool resizeable)
{
_resizeable = resizeable;
if (_win_id.valid())
_window_registry.resizeable(_win_id, resizeable);
}
};
class Wm::Nitpicker::Child_view : public View,
public List<Child_view>::Element
{
private:
Weak_ptr<View> mutable _parent;
public:
Child_view(Nitpicker::Session_client &real_nitpicker,
Session_label const &session_label,
bool has_alpha,
Weak_ptr<View> parent)
:
View(real_nitpicker, session_label, has_alpha), _parent(parent)
{
try_to_init_real_view();
}
~Child_view()
{
View::lock_for_destruction();
}
void _propagate_view_geometry() override
{
_real_nitpicker.enqueue<Command::Geometry>(_real_handle, _geometry);
}
void stack(Weak_ptr<View> neighbor_ptr, bool behind) override
{
_neighbor_ptr = neighbor_ptr;
_neighbor_behind = behind;
_apply_view_config();
}
bool belongs_to_win_id(Window_registry::Id id) const override
{
Locked_ptr<View> parent(_parent);
return parent.is_valid() && parent->belongs_to_win_id(id);
}
Point input_anchor_position() const override
{
Locked_ptr<View> parent(_parent);
if (parent.is_valid())
return parent->input_anchor_position();
return Point();
}
void try_to_init_real_view()
{
if (_real_handle.valid())
return;
Locked_ptr<View> parent(_parent);
if (!parent.is_valid())
return;
View_handle parent_handle = _real_nitpicker.view_handle(parent->real_view_cap());
if (!parent_handle.valid())
return;
_real_handle = _real_nitpicker.create_view(parent_handle);
_real_nitpicker.release_view_handle(parent_handle);
_apply_view_config();
}
void update_child_stacking()
{
_apply_view_config();
}
};
struct Wm::Nitpicker::Session_control_fn
{
virtual void session_control(char const *selector, Session::Session_control) = 0;
};
class Wm::Nitpicker::Session_component : public Rpc_object<Nitpicker::Session>,
public List<Session_component>::Element
{
private:
typedef Nitpicker::Session::View_handle View_handle;
Session_label _session_label;
Ram_session_client _ram;
Nitpicker::Connection _session { _session_label.string() };
Window_registry &_window_registry;
Session_control_fn &_session_control_fn;
Entrypoint &_ep;
Tslab<Top_level_view, 4000> _top_level_view_alloc;
Tslab<Child_view, 4000> _child_view_alloc;
List<Top_level_view> _top_level_views;
List<Child_view> _child_views;
Input::Session_component _input_session;
Input::Session_capability _input_session_cap;
Click_handler &_click_handler;
Signal_context_capability _mode_sigh;
Area _requested_size;
bool _resize_requested = false;
bool _has_alpha = false;
/*
* Command buffer
*/
typedef Nitpicker::Session::Command_buffer Command_buffer;
Attached_ram_dataspace _command_ds { &_ram, sizeof(Command_buffer) };
Command_buffer &_command_buffer = *_command_ds.local_addr<Command_buffer>();
/*
* View handle registry
*/
typedef Genode::Handle_registry<View_handle, View>
View_handle_registry;
View_handle_registry _view_handle_registry;
/*
* Input
*/
Input::Session_client _nitpicker_input { _session.input_session() };
Attached_dataspace _nitpicker_input_ds { _nitpicker_input.dataspace() };
Signal_rpc_member<Session_component> _input_dispatcher {
_ep, *this, &Session_component::_input_handler };
Point _input_origin() const
{
if (Top_level_view const *v = _top_level_views.first())
return v->virtual_position() - v->input_anchor_position();
if (Child_view const *v = _child_views.first())
return Point(0, 0) - v->input_anchor_position();
return Point();
}
/**
* Translate input event to the client's coordinate system
*/
Input::Event _translate_event(Input::Event const ev, Point const input_origin)
{
switch (ev.type()) {
case Input::Event::MOTION:
case Input::Event::PRESS:
case Input::Event::RELEASE:
case Input::Event::FOCUS:
case Input::Event::LEAVE:
{
Point abs_pos = Point(ev.ax(), ev.ay()) + input_origin;
return Input::Event(ev.type(), ev.code(),
abs_pos.x(), abs_pos.y(), 0, 0);
}
case Input::Event::TOUCH:
case Input::Event::WHEEL:
{
Point abs_pos = Point(ev.ax(), ev.ay()) + input_origin;
return Input::Event(ev.type(), ev.code(),
abs_pos.x(), abs_pos.y(), ev.rx(), ev.ry());
}
case Input::Event::INVALID:
return ev;
}
return Input::Event();
}
bool _is_click_into_unfocused_view(Input::Event const ev)
{
/*
* XXX check if unfocused
*
* Right now, we report more butten events to the layouter
* than the layouter really needs.
*/
if (ev.type() == Input::Event::PRESS && ev.keycode() == Input::BTN_LEFT)
return true;
return false;
}
bool _first_motion = true;
void _input_handler(unsigned)
{
Point const input_origin = _input_origin();
Input::Event const * const events =
_nitpicker_input_ds.local_addr<Input::Event>();
while (_nitpicker_input.is_pending()) {
size_t const num_events = _nitpicker_input.flush();
/* we trust nitpicker to return a valid number of events */
for (size_t i = 0; i < num_events; i++) {
Input::Event const ev = events[i];
/* propagate layout-affecting events to the layouter */
if (_is_click_into_unfocused_view(ev))
_click_handler.handle_click(Point(ev.ax(), ev.ay()));
/*
* Reset pointer model for the decorator once the pointer
* enters the application area of a window.
*/
if (ev.type() == Input::Event::MOTION && _first_motion) {
_click_handler.handle_enter(Point(ev.ax(), ev.ay()));
_first_motion = false;
}
if (ev.type() == Input::Event::LEAVE)
_first_motion = true;
/* submit event to the client */
_input_session.submit(_translate_event(ev, input_origin));
}
}
}
View &_create_view_object(View_handle parent_handle)
{
/*
* Create child view
*/
if (parent_handle.valid()) {
Weak_ptr<View> parent_ptr = _view_handle_registry.lookup(parent_handle);
Child_view *view = new (_child_view_alloc)
Child_view(_session, _session_label, _has_alpha, parent_ptr);
_child_views.insert(view);
return *view;
}
/*
* Create top-level view
*/
else {
Top_level_view *view = new (_top_level_view_alloc)
Top_level_view(_session, _session_label, _has_alpha, _window_registry);
view->resizeable(_mode_sigh.valid());
_top_level_views.insert(view);
return *view;
}
}
void _destroy_top_level_view(Top_level_view &view)
{
_top_level_views.remove(&view);
_ep.dissolve(view);
Genode::destroy(&_top_level_view_alloc, &view);
}
void _destroy_child_view(Child_view &view)
{
_child_views.remove(&view);
_ep.dissolve(view);
Genode::destroy(&_child_view_alloc, &view);
}
void _destroy_view_object(View &view)
{
if (Top_level_view *v = dynamic_cast<Top_level_view *>(&view))
_destroy_top_level_view(*v);
if (Child_view *v = dynamic_cast<Child_view *>(&view))
_destroy_child_view(*v);
}
void _execute_command(Command const &command)
{
switch (command.opcode) {
case Command::OP_GEOMETRY:
{
Locked_ptr<View> view(_view_handle_registry.lookup(command.geometry.view));
if (view.is_valid())
view->geometry(command.geometry.rect);
return;
}
case Command::OP_OFFSET:
{
Locked_ptr<View> view(_view_handle_registry.lookup(command.offset.view));
if (view.is_valid())
view->buffer_offset(command.offset.offset);
return;
}
case Command::OP_TO_FRONT:
{
Locked_ptr<View> view(_view_handle_registry.lookup(command.to_front.view));
if (!view.is_valid())
return;
/* bring to front if no neighbor is specified */
if (!command.to_front.neighbor.valid()) {
view->stack(Weak_ptr<View>(), true);
return;
}
/* stack view relative to neighbor */
view->stack(_view_handle_registry.lookup(command.to_front.neighbor),
true);
return;
}
case Command::OP_TO_BACK:
{
return;
}
case Command::OP_BACKGROUND:
{
return;
}
case Command::OP_TITLE:
{
char sanitized_title[command.title.title.capacity()];
Genode::strncpy(sanitized_title, command.title.title.string(),
sizeof(sanitized_title));
for (char *c = sanitized_title; *c; c++)
if (*c == '"')
*c = '\'';
Locked_ptr<View> view(_view_handle_registry.lookup(command.title.view));
if (view.is_valid())
view->title(sanitized_title);
return;
}
case Command::OP_NOP:
return;
}
}
public:
/**
* Constructor
*
* \param ep entrypoint used for managing the views
*/
Session_component(Ram_session_capability ram,
Window_registry &window_registry,
Entrypoint &ep,
Allocator &session_alloc,
Session_label const &session_label,
Click_handler &click_handler,
Session_control_fn &session_control_fn)
:
_session_label(session_label),
_ram(ram),
_window_registry(window_registry),
_session_control_fn(session_control_fn),
_ep(ep),
_top_level_view_alloc(&session_alloc),
_child_view_alloc(&session_alloc),
_input_session_cap(_ep.manage(_input_session)),
_click_handler(click_handler),
_view_handle_registry(session_alloc)
{
_nitpicker_input.sigh(_input_dispatcher);
_input_session.event_queue().enabled(true);
}
~Session_component()
{
while (Top_level_view *view = _top_level_views.first())
_destroy_view_object(*view);
while (Child_view *view = _child_views.first())
_destroy_view_object(*view);
_ep.dissolve(_input_session);
}
void upgrade(char const *args)
{
Genode::env()->parent()->upgrade(_session, args);
}
void try_to_init_real_child_views()
{
for (Child_view *v = _child_views.first(); v; v = v->next())
v->try_to_init_real_view();
}
void update_stacking_order_of_children(Window_registry::Id id)
{
for (Child_view *v = _child_views.first(); v; v = v->next())
if (v->belongs_to_win_id(id))
v->update_child_stacking();
}
void content_geometry(Window_registry::Id id, Rect rect)
{
for (Top_level_view *v = _top_level_views.first(); v; v = v->next()) {
if (!v->has_win_id(id))
continue;
v->content_geometry(rect);
break;
}
}
View_capability content_view(Window_registry::Id id)
{
for (Top_level_view *v = _top_level_views.first(); v; v = v->next())
if (v->has_win_id(id.value))
return v->content_view();
return View_capability();
}
bool has_win_id(unsigned id) const
{
for (Top_level_view const *v = _top_level_views.first(); v; v = v->next())
if (v->has_win_id(id))
return true;
return false;
}
Session_label session_label() const { return _session_label; }
bool matches_session_label(char const *selector) const
{
/*
* Append label separator to match selectors with a trailing
* separator.
*
* The code originates from nitpicker's 'session.h'.
*/
char label[Genode::Session_label::capacity() + 4];
Genode::snprintf(label, sizeof(label), "%s ->", _session_label.string());
return Genode::strcmp(label, selector,
Genode::strlen(selector)) == 0;
}
void request_resize(Area size)
{
_requested_size = size;
_resize_requested = true;
/* notify client */
if (_mode_sigh.valid())
Signal_transmitter(_mode_sigh).submit();
}
void is_hidden(bool is_hidden)
{
for (Top_level_view *v = _top_level_views.first(); v; v = v->next())
v->is_hidden(is_hidden);
}
/**
* Return session capability to real nitpicker session
*/
Capability<Session> session() { return _session; }
/*********************************
** Nitpicker session interface **
*********************************/
Framebuffer::Session_capability framebuffer_session() override
{
return _session.framebuffer_session();
}
Input::Session_capability input_session() override
{
return _input_session_cap;
}
View_handle create_view(View_handle parent) override
{
try {
View &view = _create_view_object(parent);
_ep.manage(view);
return _view_handle_registry.alloc(view);
}
catch (View_handle_registry::Lookup_failed) {
return View_handle(); }
}
void destroy_view(View_handle handle) override
{
try {
Locked_ptr<View> view(_view_handle_registry.lookup(handle));
if (view.is_valid())
_destroy_view_object(*view);
}
catch (View_handle_registry::Lookup_failed) { }
_view_handle_registry.free(handle);
}
View_handle view_handle(View_capability view_cap, View_handle handle) override
{
return _ep.rpc_ep().apply(view_cap, [&] (View *view) {
return (view) ? _view_handle_registry.alloc(*view, handle)
: View_handle(); });
}
View_capability view_capability(View_handle handle) override
{
Locked_ptr<View> view(_view_handle_registry.lookup(handle));
return view.is_valid() ? view->cap() : View_capability();
}
void release_view_handle(View_handle handle) override
{
try {
_view_handle_registry.free(handle); }
catch (View_handle_registry::Lookup_failed) {
PWRN("view lookup failed while releasing view handle");
return;
}
}
Genode::Dataspace_capability command_dataspace() override
{
return _command_ds.cap();
}
void execute() override
{
for (unsigned i = 0; i < _command_buffer.num(); i++) {
try {
_execute_command(_command_buffer.get(i)); }
catch (View_handle_registry::Lookup_failed) {
PWRN("view lookup failed during command execution"); }
}
/* propagate window-list changes to the layouter */
_window_registry.flush();
}
Framebuffer::Mode mode() override
{
Framebuffer::Mode const real_mode = _session.mode();
/*
* While resizing the window, return requested window size as
* mode
*/
if (_resize_requested)
return Framebuffer::Mode(_requested_size.w(),
_requested_size.h(),
real_mode.format());
/*
* If the first top-level view has a defined size, use it
* as the size of the virtualized nitpicker session.
*/
if (Top_level_view const *v = _top_level_views.first())
if (v->size().valid())
return Framebuffer::Mode(v->size().w(),
v->size().h(),
real_mode.format());
/*
* If top-level view has yet been defined, return the real mode.
*/
return real_mode;
}
void mode_sigh(Genode::Signal_context_capability sigh) override
{
_mode_sigh = sigh;
/*
* We consider a window as resizable if the client shows interest
* in mode-change notifications.
*/
bool const resizeable = _mode_sigh.valid();
for (Top_level_view *v = _top_level_views.first(); v; v = v->next())
v->resizeable(resizeable);
}
void buffer(Framebuffer::Mode mode, bool has_alpha) override
{
/*
* We must not perform the 'buffer' operation on the connection
* object because the 'Nitpicker::Connection::buffer'
* implementation implicitly performs upgrade operations.
*
* Here, we merely want to forward the buffer RPC call to the
* wrapped nitpicker session. Otherwise, we would perform
* session upgrades initiated by the wm client's buffer
* operation twice.
*/
Nitpicker::Session_client(_session.cap()).buffer(mode, has_alpha);
_has_alpha = has_alpha;
}
void focus(Genode::Capability<Nitpicker::Session>) { }
void session_control(Label suffix, Session_control operation) override
{
/*
* Append label argument to session label
*
* The code originates from nitpicker's 'main.cc'.
*/
char selector[Label::size()];
Genode::snprintf(selector, sizeof(selector), "%s%s%s",
_session_label.string(),
suffix.length() ? " -> " : "", suffix.string());
_session_control_fn.session_control(selector, operation);
}
};
class Wm::Nitpicker::Root : public Genode::Rpc_object<Genode::Typed_root<Session> >,
public Decorator_content_callback,
public Session_control_fn
{
private:
Entrypoint &_ep;
Allocator &_md_alloc;
Ram_session_capability _ram;
enum { STACK_SIZE = 1024*sizeof(long) };
Reporter &_pointer_reporter;
Reporter &_focus_request_reporter;
unsigned _focus_request_cnt = 0;
Last_motion _last_motion = LAST_MOTION_DECORATOR;
Window_registry &_window_registry;
Input::Session_component _window_layouter_input;
Input::Session_capability _window_layouter_input_cap {
_ep.manage(_window_layouter_input) };
/* handler that forwards clicks into unfocused windows to the layouter */
struct Click_handler : Nitpicker::Click_handler
{
Input::Session_component &window_layouter_input;
Reporter &pointer_reporter;
Last_motion &last_motion;
void _submit_button_event(Input::Event::Type type, Nitpicker::Point pos)
{
window_layouter_input.submit(Input::Event(type, Input::BTN_LEFT,
pos.x(), pos.y(), 0, 0));
}
void handle_enter(Nitpicker::Point pos) override
{
last_motion = LAST_MOTION_NITPICKER;
Reporter::Xml_generator xml(pointer_reporter, [&] ()
{
xml.attribute("xpos", pos.x());
xml.attribute("ypos", pos.y());
});
}
void handle_click(Nitpicker::Point pos) override
{
/*
* Propagate clicked-at position to decorator such that it can
* update its hover model.
*/
Reporter::Xml_generator xml(pointer_reporter, [&] ()
{
xml.attribute("xpos", pos.x());
xml.attribute("ypos", pos.y());
});
/*
* Supply artificial mouse click to the decorator's input session
* (which is routed to the layouter).
*/
_submit_button_event(Input::Event::PRESS, pos);
_submit_button_event(Input::Event::RELEASE, pos);
}
Click_handler(Input::Session_component &window_layouter_input,
Reporter &pointer_reporter,
Last_motion &last_motion)
:
window_layouter_input(window_layouter_input),
pointer_reporter(pointer_reporter),
last_motion(last_motion)
{ }
} _click_handler { _window_layouter_input, _pointer_reporter,
_last_motion };
/**
* List of regular sessions
*/
List<Session_component> _sessions;
Layouter_nitpicker_session *_layouter_session = nullptr;
List<Decorator_nitpicker_session> _decorator_sessions;
/**
* Nitpicker session used to perform session-control operations
*/
Nitpicker::Session &_focus_nitpicker_session;
public:
/**
* Constructor
*/
Root(Entrypoint &ep,
Window_registry &window_registry, Allocator &md_alloc,
Ram_session_capability ram,
Reporter &pointer_reporter, Reporter &focus_request_reporter,
Nitpicker::Session &focus_nitpicker_session)
:
_ep(ep), _md_alloc(md_alloc), _ram(ram),
_pointer_reporter(pointer_reporter),
_focus_request_reporter(focus_request_reporter),
_window_registry(window_registry),
_focus_nitpicker_session(focus_nitpicker_session)
{
_window_layouter_input.event_queue().enabled(true);
Genode::env()->parent()->announce(_ep.manage(*this));
}
/********************
** Root interface **
********************/
Genode::Session_capability session(Session_args const &args,
Affinity const &affinity) override
{
Genode::Session_label session_label(args.string());
enum Role { ROLE_DECORATOR, ROLE_LAYOUTER, ROLE_REGULAR, ROLE_DIRECT };
Role role = ROLE_REGULAR;
/*
* Determine session policy
*/
try {
Genode::Xml_node policy = Genode::Session_policy(session_label);
char const *role_attr = "role";
if (policy.has_attribute(role_attr)) {
if (policy.attribute(role_attr).has_value("layouter"))
role = ROLE_LAYOUTER;
if (policy.attribute(role_attr).has_value("decorator"))
role = ROLE_DECORATOR;
if (policy.attribute(role_attr).has_value("direct"))
role = ROLE_DIRECT;
}
}
catch (...) { }
switch (role) {
case ROLE_REGULAR:
{
auto session = new (_md_alloc)
Session_component(_ram, _window_registry,
_ep, _md_alloc, session_label,
_click_handler, *this);
_sessions.insert(session);
return _ep.manage(*session);
}
case ROLE_DECORATOR:
{
auto session = new (_md_alloc)
Decorator_nitpicker_session(_ram, _ep, _md_alloc,
_pointer_reporter,
_last_motion,
_window_layouter_input,
*this);
_decorator_sessions.insert(session);
return _ep.manage(*session);
}
case ROLE_LAYOUTER:
{
_layouter_session = new (_md_alloc)
Layouter_nitpicker_session(*Genode::env()->ram_session(),
_window_layouter_input_cap,
_focus_nitpicker_session.mode());
return _ep.manage(*_layouter_session);
}
case ROLE_DIRECT:
{
Direct_nitpicker_session *session = new (_md_alloc)
Direct_nitpicker_session(session_label);
return _ep.manage(*session);
}
}
return Session_capability();
}
void upgrade(Genode::Session_capability session_cap, Upgrade_args const &args) override
{
if (!args.is_valid_string()) throw Root::Invalid_args();
auto lambda = [&] (Rpc_object_base *session) {
if (!session) {
PDBG("session lookup failed");
return;
}
Session_component *regular_session =
dynamic_cast<Session_component *>(session);
if (regular_session)
regular_session->upgrade(args.string());
Decorator_nitpicker_session *decorator_session =
dynamic_cast<Decorator_nitpicker_session *>(session);
if (decorator_session)
decorator_session->upgrade(args.string());
Direct_nitpicker_session *direct_session =
dynamic_cast<Direct_nitpicker_session *>(session);
if (direct_session)
direct_session->upgrade(args.string());
};
_ep.rpc_ep().apply(session_cap, lambda);
}
void close(Genode::Session_capability session_cap) override
{
Genode::Rpc_entrypoint &ep = _ep.rpc_ep();
Session_component *regular_session =
ep.apply(session_cap, [this] (Session_component *session) {
if (session) {
_sessions.remove(session);
_ep.dissolve(*session);
}
return session;
});
if (regular_session) {
Genode::destroy(_md_alloc, regular_session);
return;
}
Direct_nitpicker_session *direct_session =
ep.apply(session_cap, [this] (Direct_nitpicker_session *session) {
if (session) {
_ep.dissolve(*session);
}
return session;
});
if (direct_session) {
Genode::destroy(_md_alloc, direct_session);
return;
}
Decorator_nitpicker_session *decorator_session =
ep.apply(session_cap, [this] (Decorator_nitpicker_session *session) {
if (session) {
_decorator_sessions.remove(session);
_ep.dissolve(*session);
}
return session;
});
if (decorator_session) {
Genode::destroy(_md_alloc, decorator_session);
return;
}
auto layouter_lambda = [this] (Layouter_nitpicker_session *session) {
_ep.dissolve(*_layouter_session);
_layouter_session = nullptr;
return session;
};
if (ep.apply(session_cap, layouter_lambda) == _layouter_session) {
Genode::destroy(_md_alloc, _layouter_session);
return;
}
}
/**********************************
** Session_control_fn interface **
**********************************/
void session_control(char const *selector, Session::Session_control operation) override
{
for (Session_component *s = _sessions.first(); s; s = s->next()) {
if (!s->matches_session_label(selector))
continue;
switch (operation) {
case Session::SESSION_CONTROL_SHOW:
s->is_hidden(false);
break;
case Session::SESSION_CONTROL_HIDE:
s->is_hidden(true);
break;
case Session::SESSION_CONTROL_TO_FRONT:
/* post focus request to the layouter */
Genode::Reporter::Xml_generator
xml(_focus_request_reporter, [&] () {
xml.attribute("label", s->session_label().string());
xml.attribute("id", ++_focus_request_cnt);
});
break;
}
}
_window_registry.flush();
/*
* Forward the request to the nitpicker control session to apply
* the show/hide/to-front operations on "direct" nitpicker
* sessions.
*/
_focus_nitpicker_session.session_control(selector, operation);
}
/******************************************
** Decorator_content_callback interface **
******************************************/
/*
* This function is called once the decorator has produced the content
* view for a new window, or when a window is brought to the front.
*/
View_capability content_view(Window_registry::Id id) override
{
/*
* Propagate the request to the sessions. It will be picked up
* by the session to which the specified window ID belongs.
* The real content view will be created as a side effect of
* calling 's->content_view'.
*/
for (Session_component *s = _sessions.first(); s; s = s->next())
if (s->has_win_id(id.value))
return s->content_view(id.value);
return View_capability();
}
void update_content_child_views(Window_registry::Id id) override
{
/*
* Try to create physical views for its child views.
*/
for (Session_component *s = _sessions.first(); s; s = s->next()) {
s->try_to_init_real_child_views();
}
/*
* Apply the stacking order to the child views that belong to the
* given window ID. I.e., when the window was brought to the front,
* we need to restack its child views such that they end up in
* front of the top-level view. Otherwise, the top-level view
* will obstruct the child views.
*/
for (Session_component *s = _sessions.first(); s; s = s->next())
s->update_stacking_order_of_children(id);
}
void content_geometry(Window_registry::Id id, Rect rect) override
{
for (Session_component *s = _sessions.first(); s; s = s->next())
s->content_geometry(id, rect);
}
Capability<Session> lookup_nitpicker_session(unsigned win_id)
{
for (Session_component *s = _sessions.first(); s; s = s->next())
if (s->has_win_id(win_id))
return s->session();
return Capability<Session>();
}
void request_resize(unsigned win_id, Area size)
{
for (Session_component *s = _sessions.first(); s; s = s->next())
if (s->has_win_id(win_id))
return s->request_resize(size);
}
};
#endif /* _NITPICKER_H_ */
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