Basic input

DropDownButton

A button that reveals a menu of related commands when invoked.

Example

Usage

DropDownButton menu

A drop-down button opens a menu of related commands without invoking a primary action.

#include <FluentQt/BasicInput.h>
using namespace fluent::basicinput;

auto* button = new DropDownButton("Options", this);
auto* menu = new FluentMenu("Options", button);
menu->addAction("Edit profile");
menu->addAction("Account settings");
menu->addAction("Sign out");
button->setMenu(menu);

import fluentqt

button = fluentqt.DropDownButton('Options')
button.setMinimumWidth(140)
menu = fluentqt.FluentMenu('Options', button)
menu.addAction('Edit profile')
menu.addAction('Account settings')
menu.addAction('Sign out')
button.setMenu(menu)

API

Declaration

`fluent::basicinput::DropDownButton`

Inherits Button

Fluent button that opens an attached dropdown or flyout.

Constructors

explicit DropDownButton(const QString& text, QWidget* parent = nullptr)
explicit DropDownButton(QWidget* parent = nullptr)

Properties

QMenu* menu: Caller-owned menu opened by the button.
Read menu()Write setMenu()Notify menuChanged()
bool isOpen: Whether the popup, drawer, or notification surface is open.
Read isOpen()Write setIsOpen()Notify openChanged()
QString chevronGlyph: Iconfont glyph used for the chevron affordance.
Read chevronGlyph()Write setChevronGlyph()Notify chevronChanged()
QString iconFontFamily: Iconfont family used for glyph rendering.
Read iconFontFamily()Write setIconFontFamily()Notify chevronChanged()
int chevronSize: Chevron glyph pixel size.
Read chevronSize()Write setChevronSize()Notify chevronChanged()
QPoint chevronOffset: Pixel offset applied to chevron drawing.
Read chevronOffset()Write setChevronOffset()Notify chevronChanged()
qreal pressProgress: Animated press progress used by the painted surface.
Read pressProgress()Write setPressProgress()

Methods

void setMenu(QMenu* menu): Caller-owned menu opened by the button.
QMenu* menu() const: Caller-owned menu opened by the button.
bool isOpen() const: Whether the popup, drawer, or notification surface is open.
void setOpen(bool open)
void setIsOpen(bool open): Whether the popup, drawer, or notification surface is open.
QString chevronGlyph() const: Iconfont glyph used for the chevron affordance.
void setChevronGlyph(const QString& glyph): Iconfont glyph used for the chevron affordance.
QString iconFontFamily() const: Iconfont family used for glyph rendering.
void setIconFontFamily(const QString& family): Iconfont family used for glyph rendering.
int chevronSize() const: Chevron glyph pixel size.
void setChevronSize(int size): Chevron glyph pixel size.
QPoint chevronOffset() const: Pixel offset applied to chevron drawing.
void setChevronOffset(const QPoint& offset): Pixel offset applied to chevron drawing.
qreal pressProgress() const: Animated press progress used by the painted surface.
void setPressProgress(qreal value): Animated press progress used by the painted surface.
QSize sizeHint() const override
QSize minimumSizeHint() const override

Signals

void menuChanged(): Caller-owned menu opened by the button.
void openChanged(): Whether the popup, drawer, or notification surface is open.
void chevronChanged(): Iconfont glyph used for the chevron affordance.

Destructors

~DropDownButton() override

Subclass interfaces

Methods

void paintEvent(QPaintEvent* event) override
void mousePressEvent(QMouseEvent* event) override
void keyPressEvent(QKeyEvent* event) override
QRectF contentPaintRect(const QRectF& surfaceRect) const override

Inherited from fluent::basicinput::Button

Properties

ButtonStyle fluentStyle: Visual treatment: Standard, Accent, or Subtle.
Read fluentStyle()Write setFluentStyle()Notify fluentStyleChanged()
ButtonSize fluentSize: Density token that controls height and padding, not typography.
Read fluentSize()Write setFluentSize()Notify fluentSizeChanged()
Typography::FontRole fontRole: Fluent typography role used while the button follows theme fonts.
Read fontRole()Write setFontRole()Notify fontRoleChanged()
TextColorRole textColorRole: Semantic foreground for unfilled, unchecked buttons; filled and disabled states keep their contrast roles.
Read textColorRole()Write setTextColorRole()Notify textColorRoleChanged()
ButtonLayout fluentLayout: Content layout for text and icon placement.
Read fluentLayout()Write setFluentLayout()Notify fluentLayoutChanged()
bool focusVisual: Controls whether the focus visual frame is painted.
Read hasFocusVisual()Write setFocusVisual()Notify focusVisualChanged()
InteractionState interactionState: Overrides the interaction state for guided demos or visual checks.
Read interactionState()Write setInteractionState()Notify interactionStateChanged()
bool criticalOnHover: Uses the critical semantic color while hovered or pressed.
Read criticalOnHover()Write setCriticalOnHover()Notify criticalOnHoverChanged()
QMargins cornerRadii: Per-corner radii; left/top/right/bottom map to top-left/top-right/bottom-right/bottom-left.
Read cornerRadii()Write setCornerRadii()Reset resetCornerRadii()Notify cornerRadiiChanged()
QPoint iconOffset: Pixel offset applied to iconfont drawing; positive values move right/down.
Read iconOffset()Write setIconOffset()
qreal iconRotation: Clockwise rotation applied to the painted icon in degrees.
Read iconRotation()Write setIconRotation()
qreal iconScale: Uniform scale applied to the painted iconfont glyph (1.0 = no scaling). Drives WinUI-style press feedback (a brief scale-down) without touching geometry.
Read iconScale()Write setIconScale()
qreal contentOpacity: Painter-level opacity for the whole button surface (1.0 = fully opaque). A lightweight fade that avoids QGraphicsOpacityEffect's offscreen compositing.
Read contentOpacity()Write setContentOpacity()

Methods

ButtonStyle fluentStyle() const: Fluent property accessors.
void setFluentStyle(ButtonStyle style): Visual treatment: Standard, Accent, or Subtle.
ButtonSize fluentSize() const: Density token that controls height and padding, not typography.
void setFluentSize(ButtonSize size): Density token that controls height and padding, not typography.
Typography::FontRole fontRole() const: Fluent typography role used while the button follows theme fonts.
void setFontRole(Typography::FontRole role): Fluent typography role used while the button follows theme fonts.
TextColorRole textColorRole() const: Semantic foreground for unfilled, unchecked buttons; filled and disabled states keep their contrast roles.
void setTextColorRole(TextColorRole role): Semantic foreground for unfilled, unchecked buttons; filled and disabled states keep their contrast roles.
void setFont(const QFont& font): Sets an explicit font that remains unchanged by later theme refreshes.
ButtonLayout fluentLayout() const: Content layout for text and icon placement.
void setFluentLayout(ButtonLayout layout): Content layout for text and icon placement.
bool hasFocusVisual() const: Controls whether the focus visual frame is painted.
void setFocusVisual(bool focus): Controls whether the focus visual frame is painted.
InteractionState interactionState() const: Overrides the interaction state for guided demos or visual checks.
void setInteractionState(InteractionState state): Overrides the interaction state for guided demos or visual checks.
bool criticalOnHover() const: Uses the critical semantic color while hovered or pressed.
void setCriticalOnHover(bool enabled): Uses the critical semantic color while hovered or pressed.
QMargins cornerRadii() const: Per-corner radii; left/top/right/bottom map to top-left/top-right/bottom-right/bottom-left.
void setCornerRadii(const QMargins& radii): Per-corner radii; left/top/right/bottom map to top-left/top-right/bottom-right/bottom-left.
void resetCornerRadii(): Per-corner radii; left/top/right/bottom map to top-left/top-right/bottom-right/bottom-left.
QPoint iconOffset() const: Pixel offset applied to iconfont drawing; positive values move right/down.
void setIconOffset(const QPoint& offset): Pixel offset applied to iconfont drawing; positive values move right/down.
qreal iconRotation() const: Clockwise rotation applied to the painted icon in degrees.
void setIconRotation(qreal rotation): Clockwise rotation applied to the painted icon in degrees.
qreal iconScale() const: Uniform scale applied to the painted iconfont glyph (1.0 = no scaling). Drives WinUI-style press feedback (a brief scale-down) without touching geometry.
void setIconScale(qreal scale): Uniform scale applied to the painted iconfont glyph (1.0 = no scaling). Drives WinUI-style press feedback (a brief scale-down) without touching geometry.
qreal contentOpacity() const: Painter-level opacity for the whole button surface (1.0 = fully opaque). A lightweight fade that avoids QGraphicsOpacityEffect's offscreen compositing.
void setContentOpacity(qreal opacity): Painter-level opacity for the whole button surface (1.0 = fully opaque). A lightweight fade that avoids QGraphicsOpacityEffect's offscreen compositing.
void onThemeUpdated() override
QSize sizeHint() const override: Size hints include Fluent padding, text, and iconfont content.
QSize minimumSizeHint() const override
void setIconGlyph(const QString& glyph, int pixelSize = Typography::IconSize::Standard, const QString& family = Typography::FontFamily::FluentIcons): Sets an iconfont glyph that is drawn directly during paintEvent().
void setIconGlyph(QChar glyph, int pixelSize = Typography::IconSize::Standard, const QString& family = Typography::FontFamily::FluentIcons)

Signals

void fluentStyleChanged(): Visual treatment: Standard, Accent, or Subtle.
void fluentSizeChanged(): Density token that controls height and padding, not typography.
void fontRoleChanged(): Fluent typography role used while the button follows theme fonts.
void textColorRoleChanged(): Semantic foreground for unfilled, unchecked buttons; filled and disabled states keep their contrast roles.
void fluentLayoutChanged(): Content layout for text and icon placement.
void focusVisualChanged(): Controls whether the focus visual frame is painted.
void interactionStateChanged(): Overrides the interaction state for guided demos or visual checks.
void criticalOnHoverChanged(): Uses the critical semantic color while hovered or pressed.
void cornerRadiiChanged(): Per-corner radii; left/top/right/bottom map to top-left/top-right/bottom-right/bottom-left.

Enumerations

enum ButtonStyle: Button visual style resolved against Fluent design tokens.
Standard
Accent
Subtle
enum ButtonSize: Button density presets for padding and preferred height.
Small
StandardSize
Large
enum ButtonLayout: Text/icon composition mode.
TextOnly
IconBefore
IconOnly
IconAfter
enum class TextColorRole: Semantic text and icon emphasis.
Primary
Secondary
Accent
enum InteractionState: Paint-state override used before falling back to real hover/press state.
Rest
Hover
Pressed
Disabled

Inherited from fluent::FluentElement

Methods

static void setTheme(Theme theme): Updates the global theme and notifies active FluentElement instances.
static void setThemeDeferred(Theme theme): Schedules a visible-first batched theme refresh without blocking the current interaction.
static Theme currentTheme(): Returns the currently active global theme.
static bool themeUsesDarkAppearance(Theme theme): Returns whether a theme uses dark-backed chrome and material tokens.
static void refreshTheme(): Re-broadcasts the current theme to repaint after a design-token change.
static int themeGeneration(): Monotonic counter bumped on every theme change, for staleness checks.
Theme effectiveTheme() const: Resolves the theme used by this element, honoring an inherited QWidget override.
bool effectiveThemeUsesDarkAppearance() const: Returns whether this element's effective theme uses dark-backed chrome.
bool setThemeOverrides(const QJsonObject& overrides): Component-facing token accessors.
QJsonObject themeOverrides() const: Returns this element's authored overrides.
void clearThemeOverrides(): Restores all token fields to global theme defaults.
Colors themeColors() const
const Colors& themeColorsRef() const: Non-copying access to the active color set (for hot paint paths).
FontStyle themeFont(Typography::FontRole role = Typography::FontRole::Body) const
Radius themeRadius() const
Spacing themeSpacing() const
Animation themeAnimation() const
Material::AcrylicToken themeAcrylic() const: Material, elevation, and adaptive layout tokens.
Material::MicaToken themeMica() const
Material::SmokeToken themeSmoke() const
Elevation::ShadowParams themeShadow(Elevation::Level level) const
int themeBreakpoint(Breakpoints::Breakpoint breakpoint = Breakpoints::Breakpoint::Medium) const
QColor themeBackdrop(bool active) const: Window-chrome backdrop color for the given activation state.
virtual void onThemeUpdated(): Called after the global theme changes.

Enumerations

enum Theme: Global visual theme used when resolving design tokens.
Light = 0
Dark = 1
HighContrast = 2

Types and aliases

struct Colors: Design token snapshots returned to components.
struct FontStyle
struct Radius
struct Spacing
struct Animation

Inherited from fluent::QMLPlus

Methods

AnchorLayout::Anchors* anchors(): Returns mutable anchors for the QWidget host.
void setState(const QString& name): Applies a named state, or clears state when name is empty.
QString state() const
void addState(const QMLState& state): Registers or replaces a named state definition.
void evaluateStates(): Reevaluates conditions; the first registered true condition wins.
QMLPlusRuntime* runtime(): Returns the lazy host-owned state observation object.
void setAnchors(const AnchorLayout::Anchors& anchors): Replaces all host anchors and invalidates the parent layout.
void resetAnchors(): Clears all host anchors and invalidates the parent layout.
void bind(const char* targetProp, QObject* source, const char* sourceProp, PropertyBinder::Direction dir = PropertyBinder::OneWay): Binds a source property to a property on the QWidget host.
BindingHandle bindManaged(const char* targetProp, QObject* source, const char* sourceProp, PropertyBinder::Direction direction = PropertyBinder::OneWay, BindingOptions options = {}): Installs a managed direct binding on this QWidget host.
BindingHandle bindComputed(const char* targetProp, const QVector<BindingDependency>& dependencies, std::function<QVariant()> evaluate, BindingOptions options = {}): Installs an explicit-dependency C++ expression on this QWidget host.
void addTransition(const StateTransition& transition): Registers a state transition in precedence order.
void setBehavior(const char* propertyName, const PropertyAnimation& animation): Sets the default animation for this host's managed property writes.
void clearBehavior(const char* propertyName): Removes the default animation for future managed writes.
bool writeProperty(const char* propertyName, const QVariant& value): Writes a host property through Behavior without removing its binding.

All inherited Qt members：QPushButton