138 lines
3.5 KiB
C++
138 lines
3.5 KiB
C++
// This file is part of Desktop App Toolkit,
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// a set of libraries for developing nice desktop applications.
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//
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// For license and copyright information please follow this link:
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// https://github.com/desktop-app/legal/blob/master/LEGAL
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//
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#pragma once
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#include "base/basic_types.h"
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#include "base/flat_map.h"
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#include <QtCore/QVariant>
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class ClickHandler;
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using ClickHandlerPtr = std::shared_ptr<ClickHandler>;
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struct ClickContext {
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Qt::MouseButton button = Qt::LeftButton;
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QVariant other;
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};
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class ClickHandlerHost {
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protected:
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virtual void clickHandlerActiveChanged(const ClickHandlerPtr &action, bool active) {
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}
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virtual void clickHandlerPressedChanged(const ClickHandlerPtr &action, bool pressed) {
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}
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virtual ~ClickHandlerHost() = 0;
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friend class ClickHandler;
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};
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enum class EntityType : uchar;
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class ClickHandler {
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public:
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virtual ~ClickHandler() {
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}
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virtual void onClick(ClickContext context) const = 0;
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// What text to show in a tooltip when mouse is over that click handler as a link in Text.
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virtual QString tooltip() const {
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return QString();
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}
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// What to drop in the input fields when dragging that click handler as a link from Text.
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virtual QString dragText() const {
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return QString();
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}
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// Copy to clipboard support.
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virtual QString copyToClipboardText() const {
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return QString();
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}
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virtual QString copyToClipboardContextItemText() const {
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return QString();
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}
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// Entities in text support.
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struct TextEntity {
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EntityType type = EntityType();
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QString data;
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};
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virtual TextEntity getTextEntity() const;
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void setProperty(int id, QVariant value);
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[[nodiscard]] const QVariant &property(int id) const;
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// This method should be called on mouse over a click handler.
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// It returns true if the active handler was changed or false otherwise.
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static bool setActive(const ClickHandlerPtr &p, ClickHandlerHost *host = nullptr);
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// This method should be called when mouse leaves the host.
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// It returns true if the active handler was changed or false otherwise.
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static bool clearActive(ClickHandlerHost *host = nullptr);
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// This method should be called on mouse press event.
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static void pressed();
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// This method should be called on mouse release event.
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// The activated click handler (if any) is returned.
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static ClickHandlerPtr unpressed();
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static ClickHandlerPtr getActive();
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static ClickHandlerPtr getPressed();
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static bool showAsActive(const ClickHandlerPtr &p);
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static bool showAsPressed(const ClickHandlerPtr &p);
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static void hostDestroyed(ClickHandlerHost *host);
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private:
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static ClickHandlerHost *_activeHost;
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static ClickHandlerHost *_pressedHost;
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base::flat_map<int, QVariant> _properties;
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};
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class LeftButtonClickHandler : public ClickHandler {
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public:
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void onClick(ClickContext context) const override final {
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if (context.button == Qt::LeftButton) {
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onClickImpl();
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}
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}
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protected:
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virtual void onClickImpl() const = 0;
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};
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class LambdaClickHandler : public ClickHandler {
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public:
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LambdaClickHandler(Fn<void()> handler)
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: _handler([handler = std::move(handler)](ClickContext) { handler(); }) {
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}
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LambdaClickHandler(Fn<void(ClickContext)> handler)
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: _handler(std::move(handler)) {
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}
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void onClick(ClickContext context) const override final {
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if (context.button == Qt::LeftButton && _handler) {
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_handler(context);
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}
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}
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private:
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Fn<void(ClickContext)> _handler;
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};
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void ActivateClickHandler(
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not_null<QWidget*> guard,
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ClickHandlerPtr handler,
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ClickContext context);
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void ActivateClickHandler(
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not_null<QWidget*> guard,
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ClickHandlerPtr handler,
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Qt::MouseButton button);
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