76 lines
2.3 KiB
C++
76 lines
2.3 KiB
C++
/*
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src/label.cpp -- Text label with an arbitrary font, color, and size
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NanoGUI was developed by Wenzel Jakob <wenzel@inf.ethz.ch>.
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The widget drawing code is based on the NanoVG demo application
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by Mikko Mononen.
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All rights reserved. Use of this source code is governed by a
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BSD-style license that can be found in the LICENSE.txt file.
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*/
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#include <nanogui/label.h>
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#include <nanogui/theme.h>
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#include <nanogui/opengl.h>
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#include <nanogui/serializer/core.h>
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NAMESPACE_BEGIN(nanogui)
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Label::Label(Widget *parent, const std::string &caption, const std::string &font, int fontSize)
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: Widget(parent), mCaption(caption), mFont(font) {
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mFontSize = fontSize < 0 ? mTheme->mStandardFontSize : fontSize;
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mColor = mTheme->mTextColor;
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}
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Vector2i Label::preferredSize(NVGcontext *ctx) const {
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if (mCaption == "")
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return Vector2i::Zero();
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nvgFontFace(ctx, mFont.c_str());
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nvgFontSize(ctx, fontSize());
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if (mFixedSize.x() > 0) {
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float bounds[4];
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nvgTextAlign(ctx, NVG_ALIGN_LEFT | NVG_ALIGN_TOP);
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nvgTextBoxBounds(ctx, mPos.x(), mPos.y(), mFixedSize.x(), mCaption.c_str(), nullptr, bounds);
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return Vector2i(
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mFixedSize.x(), (bounds[3]-bounds[1])
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);
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} else {
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nvgTextAlign(ctx, NVG_ALIGN_LEFT | NVG_ALIGN_MIDDLE);
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return Vector2i(
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nvgTextBounds(ctx, 0, 0, mCaption.c_str(), nullptr, nullptr),
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mTheme->mStandardFontSize
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);
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}
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}
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void Label::draw(NVGcontext *ctx) {
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Widget::draw(ctx);
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nvgFontFace(ctx, mFont.c_str());
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nvgFontSize(ctx, fontSize());
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nvgFillColor(ctx, mColor);
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if (mFixedSize.x() > 0) {
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nvgTextAlign(ctx, NVG_ALIGN_LEFT | NVG_ALIGN_TOP);
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nvgTextBox(ctx, mPos.x(), mPos.y(), mFixedSize.x(), mCaption.c_str(), nullptr);
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} else {
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nvgTextAlign(ctx, NVG_ALIGN_LEFT | NVG_ALIGN_MIDDLE);
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nvgText(ctx, mPos.x(), mPos.y() + mSize.y() * 0.5f, mCaption.c_str(), nullptr);
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}
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}
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void Label::save(Serializer &s) const {
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Widget::save(s);
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s.set("caption", mCaption);
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s.set("font", mFont);
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s.set("color", mColor);
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}
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bool Label::load(Serializer &s) {
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if (!Widget::load(s)) return false;
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if (!s.get("caption", mCaption)) return false;
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if (!s.get("font", mFont)) return false;
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if (!s.get("color", mColor)) return false;
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return true;
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}
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NAMESPACE_END(nanogui)
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