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widget.cpp
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widget.cpp
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#include <nanogui/widget.h>
#include <nanogui/layout.h>
#include <nanogui/theme.h>
#include <nanogui/window.h>
#include <nanogui/opengl.h>
#include <nanogui/screen.h>
NANOGUI_NAMESPACE_BEGIN
Widget::Widget(Widget *parent)
: mParent(nullptr), mLayout(nullptr), mPos(Vector2i::Zero()),
mSize(Vector2i::Zero()), mFixedSize(Vector2i::Zero()), mVisible(true),
mEnabled(true), mFocused(false), mMouseFocus(false), mTooltip("") {
if (parent) {
parent->addChild(this);
mTheme = parent->mTheme;
}
}
Widget::~Widget() {
for (auto child : mChildren)
delete child;
if (mLayout)
delete mLayout;
}
Vector2i Widget::preferredSize(NVGcontext *ctx) const {
if (mLayout)
return mLayout->preferredSize(ctx, this);
else
return mSize;
}
void Widget::performLayout(NVGcontext *ctx) {
if (mLayout) {
mLayout->performLayout(ctx, this);
} else {
for (auto c : mChildren) {
Vector2i pref = c->preferredSize(ctx), fix = c->fixedSize();
c->setSize(Vector2i(
fix[0] ? fix[0] : pref[0],
fix[1] ? fix[1] : pref[1]
));
c->performLayout(ctx);
}
}
}
Widget *Widget::findWidget(const Vector2i &p) {
for (auto it = mChildren.rbegin(); it != mChildren.rend(); ++it) {
Widget *child = *it;
if (child->visible() && child->contains(p - mPos))
return child->findWidget(p - mPos);
}
return contains(p) ? this : nullptr;
}
bool Widget::mouseButtonEvent(const Vector2i &p, int button, bool down, int modifiers) {
for (auto it = mChildren.rbegin(); it != mChildren.rend(); ++it) {
Widget *child = *it;
if (child->visible() && child->contains(p - mPos) &&
child->mouseButtonEvent(p - mPos, button, down, modifiers))
return true;
}
if (button == GLFW_MOUSE_BUTTON_1 && down && !mFocused)
requestFocus();
return false;
}
bool Widget::mouseMotionEvent(const Vector2i &p, const Vector2i &rel, int button, int modifiers) {
for (auto it = mChildren.rbegin(); it != mChildren.rend(); ++it) {
Widget *child = *it;
if (!child->visible())
continue;
bool contained = child->contains(p - mPos), prevContained = child->contains(p - mPos - rel);
if (contained != prevContained)
child->mouseEnterEvent(p, contained);
if ((contained || prevContained) && child->mouseMotionEvent(p - mPos, rel, button, modifiers))
return true;
}
return false;
}
bool Widget::scrollEvent(const Vector2i &p, const Vector2f &rel) {
for (auto it = mChildren.rbegin(); it != mChildren.rend(); ++it) {
Widget *child = *it;
if (!child->visible())
continue;
if (child->contains(p - mPos) && child->scrollEvent(p - mPos, rel))
return true;
}
return false;
}
bool Widget::mouseDragEvent(const Vector2i &p, const Vector2i &rel, int button, int modifiers) {
return false;
}
bool Widget::mouseEnterEvent(const Vector2i &p, bool enter) {
mMouseFocus = enter;
return false;
}
bool Widget::focusEvent(bool focused) {
mFocused = focused;
return false;
}
bool Widget::keyboardEvent(int key, int scancode, bool press, int modifiers) {
return false;
}
void Widget::addChild(Widget *widget) {
mChildren.push_back(widget);
widget->setParent(this);
}
Window *Widget::window() {
Widget *widget = this;
while (true) {
if (!widget)
throw std::runtime_error(
"Widget:internal error (could not find parent window)");
Window *window = dynamic_cast<Window *>(widget);
if (window)
return window;
widget = widget->parent();
}
}
inline void Widget::requestFocus() {
Widget *widget = this;
while (widget->parent())
widget = widget->parent();
((Screen *) widget)->updateFocus(this);
}
void Widget::draw(NVGcontext *ctx) {
#if NANOGUI_SHOW_WIDGET_BOUNDS
nvgStrokeWidth(ctx, 1.0f);
nvgBeginPath(ctx);
nvgRect(ctx, mPos.x() - 0.5f, mPos.y() - 0.5f, mSize.x() + 1, mSize.y() + 1);
nvgStrokeColor(ctx, nvgRGBA(255, 0, 0, 255));
nvgStroke(ctx);
#endif
if (mChildren.empty())
return;
nvgTranslate(ctx, mPos.x(), mPos.y());
for (auto child : mChildren)
if (child->visible())
child->draw(ctx);
nvgTranslate(ctx, -mPos.x(), -mPos.y());
}
NANOGUI_NAMESPACE_END