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/***********************************************************************
* fscrollbar.h - Widget FScrollbar *
* *
* This file is part of the FINAL CUT widget toolkit *
* *
* Copyright 2012-2022 Markus Gans *
* *
* FINAL CUT 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 3 of *
* the License, or (at your option) any later version. *
* *
* FINAL CUT 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 program. If not, see *
* <http://www.gnu.org/licenses/>. *
***********************************************************************/
/* Inheritance diagram
* ═══════════════════
*
* ▕▔▔▔▔▔▔▔▔▔▏ ▕▔▔▔▔▔▔▔▔▔▏
* ▕ FVTerm ▏ ▕ FObject ▏
* ▕▁▁▁▁▁▁▁▁▁▏ ▕▁▁▁▁▁▁▁▁▁▏
* ▲ ▲
* │ │
* └─────┬─────┘
* │
* ▕▔▔▔▔▔▔▔▔▔▏
* ▕ FWidget ▏
* ▕▁▁▁▁▁▁▁▁▁▏
* ▲
* │
* ▕▔▔▔▔▔▔▔▔▔▔▔▔▏
* ▕ FScrollbar ▏
* ▕▁▁▁▁▁▁▁▁▁▁▁▁▏
*/
#ifndef FSCROLLBAR_H
#define FSCROLLBAR_H
#if !defined (USE_FINAL_H) && !defined (COMPILE_FINAL_CUT)
#error "Only <final/final.h> can be included directly."
#endif
#include <functional>
#include <memory>
#include "final/fapplication.h"
#include "final/fwidget.h"
#include "final/util/flog.h"
namespace finalcut
{
// class forward declaration
class FScrollbar;
// Global using-declaration
using FScrollbarPtr = std::shared_ptr<FScrollbar>;
//----------------------------------------------------------------------
// class FScrollbar
//----------------------------------------------------------------------
class FScrollbar : public FWidget
{
public:
// Using-declaration
using FWidget::setGeometry;
// Enumeration
enum class ScrollType
{
None = 0,
Jump = 1,
StepBackward = 2,
StepForward = 3,
PageBackward = 4,
PageForward = 5,
WheelUp = 6,
WheelDown = 7
};
// Constructors
explicit FScrollbar (FWidget* = nullptr);
explicit FScrollbar (Orientation = Orientation::Vertical, FWidget* = nullptr);
// Destructor
~FScrollbar() override;
// Accessors
auto getClassName() const -> FString override;
auto getValue() const noexcept -> int;
auto getScrollType() const -> ScrollType;
// Mutators
void setMinimum (int);
void setMaximum (int);
void setRange (int, int);
void setValue (int);
void setSteps (double);
void setPageSize (int, int);
void setOrientation (Orientation);
void setSize (const FSize&, bool = true) override;
void setGeometry (const FPoint&, const FSize&, bool = true) override;
// Methods
void resize() override;
void redraw() override;
void calculateSliderValues();
void drawBar();
// Event handlers
void onMouseDown (FMouseEvent*) override;
void onMouseUp (FMouseEvent*) override;
void onMouseMove (FMouseEvent*) override;
void onWheel (FWheelEvent*) override;
void onTimer (FTimerEvent*) override;
private:
// Methods
void init();
void draw() override;
void drawVerticalBar();
void drawVerticalBackgroundLine();
void drawHorizontalBar();
void drawHorizontalBackgroundColumn();
void drawButtons();
auto getClickedScrollType (int, int) const -> ScrollType;
auto getVerticalClickedScrollType (int) const -> ScrollType;
auto getHorizontalClickedScrollType (int) const -> ScrollType;
auto getSliderClickPos (int, int) const -> int;
void jumpToClickPos (int, int);
void jumpToClickPos (int);
void avoidScrollOvershoot();
void processScroll();
void changeOnResize();
// Data members
ScrollType scroll_type{ScrollType::None};
bool threshold_reached{false};
int threshold_time{500};
int repeat_time{80};
int slider_click_pos{-1};
int slider_click_stop_pos{-1};
int current_slider_pos{-1};
int slider_pos{0};
std::size_t slider_length{18}; // = bar_length
std::size_t bar_length{18}; // = length - 2
int val{0};
int min{0};
int max{99};
int pagesize{0};
double steps{1};
std::size_t length{20};
Orientation bar_orientation{Orientation::Vertical};
int max_color{FVTerm::getFOutput()->getMaxColor()};
};
// non-member functions
//----------------------------------------------------------------------
template <typename Instance
, typename Callback>
void initScrollbar ( FScrollbarPtr& bar
, Orientation o
, Instance cb_instance
, const Callback& cb_handler )
{
bar = std::make_shared<FScrollbar>(o, cb_instance);
bar->setMinimum(0);
bar->setValue(0);
bar->hide();
bar->addCallback
(
"change-value",
std::bind(cb_handler, cb_instance, bar.get())
);
}
// FScrollbar inline functions
//----------------------------------------------------------------------
inline auto FScrollbar::getClassName() const -> FString
{ return "FScrollbar"; }
//----------------------------------------------------------------------
inline auto FScrollbar::getValue() const noexcept -> int
{ return val; }
//----------------------------------------------------------------------
inline auto FScrollbar::getScrollType() const -> ScrollType
{ return scroll_type; }
} // namespace finalcut
#endif // FSCROLLBAR_H
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