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* Collection of shorthands to deal with GDK events.
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* Krzysztof Kosiński <tweenk.pl@gmail.com>
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* Copyright (C) 2009 Authors
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* Released under GNU GPL, read the file 'COPYING' for more information
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#ifndef SEEN_UI_TOOL_EVENT_UTILS_H
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#define SEEN_UI_TOOL_EVENT_UTILS_H
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#include <2geom/point.h>
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inline bool state_held_shift(unsigned state) {
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return state & GDK_SHIFT_MASK;
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inline bool state_held_control(unsigned state) {
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return state & GDK_CONTROL_MASK;
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inline bool state_held_alt(unsigned state) {
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return state & GDK_MOD1_MASK;
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inline bool state_held_only_shift(unsigned state) {
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return (state & GDK_SHIFT_MASK) && !(state & (GDK_CONTROL_MASK | GDK_MOD1_MASK));
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inline bool state_held_only_control(unsigned state) {
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return (state & GDK_CONTROL_MASK) && !(state & (GDK_SHIFT_MASK | GDK_MOD1_MASK));
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inline bool state_held_only_alt(unsigned state) {
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return (state & GDK_MOD1_MASK) && !(state & (GDK_SHIFT_MASK | GDK_CONTROL_MASK));
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inline bool state_held_any_modifiers(unsigned state) {
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return state & (GDK_SHIFT_MASK | GDK_CONTROL_MASK | GDK_MOD1_MASK);
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inline bool state_held_no_modifiers(unsigned state) {
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return !state_held_any_modifiers(state);
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template <unsigned button>
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inline bool state_held_button(unsigned state) {
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return (button == 0 || button > 5) ? false : state & (GDK_BUTTON1_MASK << (button-1));
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/** Checks whether Shift was held when the event was generated. */
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inline bool held_shift(E const &event) {
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return state_held_shift(event.state);
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/** Checks whether Control was held when the event was generated. */
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inline bool held_control(E const &event) {
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return state_held_control(event.state);
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/** Checks whether Alt was held when the event was generated. */
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inline bool held_alt(E const &event) {
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return state_held_alt(event.state);
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/** True if from the set of Ctrl, Shift and Alt only Ctrl was held when the event
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inline bool held_only_control(E const &event) {
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return state_held_only_control(event.state);
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/** True if from the set of Ctrl, Shift and Alt only Shift was held when the event
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inline bool held_only_shift(E const &event) {
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return state_held_only_shift(event.state);
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/** True if from the set of Ctrl, Shift and Alt only Alt was held when the event
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inline bool held_only_alt(E const &event) {
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return state_held_only_alt(event.state);
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inline bool held_no_modifiers(E const &event) {
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return state_held_no_modifiers(event.state);
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inline bool held_any_modifiers(E const &event) {
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return state_held_any_modifiers(event.state);
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template <typename E>
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inline Geom::Point event_point(E const &event) {
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return Geom::Point(event.x, event.y);
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* @code if (held_button<2>(event->motion)) { ... @endcode */
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template <unsigned button, typename E>
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inline bool held_button(E const &event) {
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return state_held_button<button>(event.state);
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guint shortcut_key(GdkEventKey const &event);
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unsigned combine_key_events(guint keyval, gint mask);
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unsigned combine_motion_events(SPCanvas *canvas, GdkEventMotion &event, gint mask);
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unsigned state_after_event(GdkEvent *event);
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} // namespace Inkscape
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c-file-style:"stroustrup"
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c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
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// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :