diff options
Diffstat (limited to 'src/context-fns.cpp')
| -rw-r--r-- | src/context-fns.cpp | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/src/context-fns.cpp b/src/context-fns.cpp new file mode 100644 index 000000000..42100d49a --- /dev/null +++ b/src/context-fns.cpp @@ -0,0 +1,192 @@ +#include <glibmm/i18n.h> +#include "sp-item.h" +#include "desktop.h" +#include "message-context.h" +#include "message-stack.h" +#include "context-fns.h" +#include "snap.h" +#include "desktop-affine.h" +#include "event-context.h" + +/* FIXME: could probably use a template here */ + +/** + * Check to see if the current layer is both unhidden and unlocked. If not, + * set a message about it on the given context. + * + * \param desktop Desktop. + * \param message Message context to put messages on. + * \return true if the current layer is both unhidden and unlocked, otherwise false. + */ + +bool Inkscape::have_viable_layer(SPDesktop *desktop, MessageContext *message) +{ + SPItem const *layer = SP_ITEM(desktop->currentLayer()); + + if ( !layer || desktop->itemIsHidden(layer) ) { + message->flash(Inkscape::ERROR_MESSAGE, + _("<b>Current layer is hidden</b>. Unhide it to be able to draw on it.")); + return false; + } + + if ( !layer || layer->isLocked() ) { + message->flash(Inkscape::ERROR_MESSAGE, + _("<b>Current layer is locked</b>. Unlock it to be able to draw on it.")); + return false; + } + + return true; +} + + +/** + * Check to see if the current layer is both unhidden and unlocked. If not, + * set a message about it on the given context. + * + * \param desktop Desktop. + * \param message Message context to put messages on. + * \return true if the current layer is both unhidden and unlocked, otherwise false. + */ + +bool Inkscape::have_viable_layer(SPDesktop *desktop, MessageStack *message) +{ + SPItem const *layer = SP_ITEM(desktop->currentLayer()); + + if ( !layer || desktop->itemIsHidden(layer) ) { + message->flash(Inkscape::WARNING_MESSAGE, + _("<b>Current layer is hidden</b>. Unhide it to be able to draw on it.")); + return false; + } + + if ( !layer || layer->isLocked() ) { + message->flash(Inkscape::WARNING_MESSAGE, + _("<b>Current layer is locked</b>. Unlock it to be able to draw on it.")); + return false; + } + + return true; +} + + +NR::Rect Inkscape::snap_rectangular_box(SPDesktop const *desktop, SPItem *item, + NR::Point const &pt, NR::Point const ¢er, int state) +{ + NR::Point p[2]; + + bool const shift = state & GDK_SHIFT_MASK; + bool const control = state & GDK_CONTROL_MASK; + + SnapManager const m(desktop->namedview); + + if (control) { + + /* Control is down: we are constrained to producing integer-ratio rectangles */ + + /* Vector from the centre of the box to the point we are dragging to */ + NR::Point delta = pt - center; + + /* Round it so that we have an integer-ratio box */ + if (fabs(delta[NR::X]) > fabs(delta[NR::Y]) && (delta[NR::Y] != 0.0)) { + delta[NR::X] = floor(delta[NR::X] / delta[NR::Y] + 0.5) * delta[NR::Y]; + } else if (delta[NR::X] != 0.0) { + delta[NR::Y] = floor(delta[NR::Y] / delta[NR::X] + 0.5) * delta[NR::X]; + } + + /* p[1] is the dragged point with the integer-ratio constraint */ + p[1] = center + delta; + + if (shift) { + + /* Shift is down, so our origin is the centre point rather than the corner + ** point; this means that corner-point movements are bound to each other. + */ + + /* p[0] is the opposite corner of our box */ + p[0] = center - delta; + + Inkscape::SnappedPoint s[2]; + + /* Try to snap p[0] (the opposite corner) along the constraint vector */ + s[0] = m.constrainedSnap(Inkscape::Snapper::SNAP_POINT, + p[0], p[0] - p[1], item); + + /* Try to snap p[1] (the dragged corner) along the constraint vector */ + s[1] = m.constrainedSnap(Inkscape::Snapper::SNAP_POINT, + p[1], p[1] - p[0], item); + + /* Choose the best snap and update points accordingly */ + if (s[0].getDistance() < s[1].getDistance()) { + p[0] = s[0].getPoint(); + p[1] = 2 * center - s[0].getPoint(); + } else { + p[0] = 2 * center - s[1].getPoint(); + p[1] = s[1].getPoint(); + } + + } else { + + /* Our origin is the opposite corner. Snap the drag point along the constraint vector */ + p[0] = center; + p[1] = m.constrainedSnap(Inkscape::Snapper::SNAP_POINT, p[1], p[1] - p[0], item).getPoint(); + } + + } else if (shift) { + + /* Shift is down, so our origin is the centre point rather than the corner point; + ** this means that corner-point movements are bound to each other. + */ + + p[1] = pt; + p[0] = 2 * center - p[1]; + + Inkscape::SnappedPoint s[2]; + + s[0] = m.freeSnap(Inkscape::Snapper::SNAP_POINT, p[0], item); + s[1] = m.freeSnap(Inkscape::Snapper::SNAP_POINT, p[1], item); + + if (s[0].getDistance() < s[1].getDistance()) { + p[0] = s[0].getPoint(); + p[1] = 2 * center - s[0].getPoint(); + } else { + p[0] = 2 * center - s[1].getPoint(); + p[1] = s[1].getPoint(); + } + + } else { + + /* There's no constraint on the corner point, so just snap it to anything */ + p[0] = center; + p[1] = m.freeSnap(Inkscape::Snapper::SNAP_POINT, pt, item).getPoint(); + } + + p[0] = sp_desktop_dt2root_xy_point(desktop, p[0]); + p[1] = sp_desktop_dt2root_xy_point(desktop, p[1]); + + return NR::Rect(NR::Point(MIN(p[0][NR::X], p[1][NR::X]), MIN(p[0][NR::Y], p[1][NR::Y])), + NR::Point(MAX(p[0][NR::X], p[1][NR::X]), MAX(p[0][NR::Y], p[1][NR::Y]))); +} + + + +NR::Point Inkscape::setup_for_drag_start(SPDesktop *desktop, SPEventContext* ec, GdkEvent *ev) +{ + ec->xp = static_cast<gint>(ev->button.x); + ec->yp = static_cast<gint>(ev->button.y); + ec->within_tolerance = true; + + NR::Point const p(ev->button.x, ev->button.y); + ec->item_to_select = sp_event_context_find_item(desktop, p, ev->button.state & GDK_MOD1_MASK, TRUE); + return ec->desktop->w2d(p); +} + + +/* + Local Variables: + mode:c++ + c-file-style:"stroustrup" + c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +)) + indent-tabs-mode:nil + fill-column:99 + End: +*/ +// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 : |