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/* Copyright 2020 Jaakko Keränen <jaakko.keranen@iki.fi>
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
#pragma once
/* Base class for UI widgets. */
#include "metrics.h"
#include "util.h"
#include <the_Foundation/object.h>
#include <the_Foundation/objectlist.h>
#include <the_Foundation/ptrarray.h>
#include <the_Foundation/rect.h>
#include <the_Foundation/string.h>
#include <SDL_events.h>
iDeclareType(Root) /* each widget is associated with a Root */
#define iDeclareWidgetClass(className) \
iDeclareType(className); \
typedef iWidgetClass i##className##Class; \
extern i##className##Class Class_##className;
iDeclareType(Widget)
iBeginDeclareClass(Widget)
iBool (*processEvent) (iWidget *, const SDL_Event *);
void (*draw) (const iWidget *);
void (*sizeChanged) (iWidget *); /* optional, defaults to NULL */
iEndDeclareClass(Widget)
enum iWidgetFlag {
hidden_WidgetFlag = iBit(1),
disabled_WidgetFlag = iBit(2),
hover_WidgetFlag = iBit(3), /* eligible for mouse hover */
selected_WidgetFlag = iBit(4),
pressed_WidgetFlag = iBit(5),
alignLeft_WidgetFlag = iBit(6),
alignRight_WidgetFlag = iBit(7),
frameless_WidgetFlag = iBit(8),
commandOnClick_WidgetFlag = iBit(9),
commandOnMouseMiss_WidgetFlag = iBit(10),
drawKey_WidgetFlag = iBit(11),
focusable_WidgetFlag = iBit(12),
tight_WidgetFlag = iBit(13), /* smaller padding */
keepOnTop_WidgetFlag = iBit(14), /* gets events first; drawn last */
mouseModal_WidgetFlag = iBit(15), /* eats all unprocessed mouse events */
radio_WidgetFlag = iBit(16), /* select on click; deselect siblings */
/* arrangement */
fixedPosition_WidgetFlag = iBit(17),
arrangeHorizontal_WidgetFlag = iBit(18), /* arrange children horizontally */
arrangeVertical_WidgetFlag = iBit(19), /* arrange children vertically */
arrangeWidth_WidgetFlag = iBit(20), /* area of children becomes parent size */
arrangeHeight_WidgetFlag = iBit(21), /* area of children becomes parent size */
resizeWidthOfChildren_WidgetFlag = iBit(22),
resizeHeightOfChildren_WidgetFlag = iBit(23),
expand_WidgetFlag = iBit(24),
fixedWidth_WidgetFlag = iBit(25),
fixedHeight_WidgetFlag = iBit(26),
resizeChildrenToWidestChild_WidgetFlag = iBit(27),
resizeToParentWidth_WidgetFlag = iBit(28),
resizeToParentHeight_WidgetFlag = iBit(29),
collapse_WidgetFlag = iBit(30), /* if hidden, arrange size to zero */
/* combinations */
arrangeSize_WidgetFlag = arrangeWidth_WidgetFlag | arrangeHeight_WidgetFlag,
resizeChildren_WidgetFlag = resizeWidthOfChildren_WidgetFlag | resizeHeightOfChildren_WidgetFlag,
fixedSize_WidgetFlag = fixedWidth_WidgetFlag | fixedHeight_WidgetFlag,
};
/* 64-bit extended flags */
#define rightEdgeDraggable_WidgetFlag iBit64(32)
#define disabledWhenHidden_WidgetFlag iBit64(32)
#define centerHorizontal_WidgetFlag iBit64(33)
#define moveToParentLeftEdge_WidgetFlag iBit64(34)
#define moveToParentRightEdge_WidgetFlag iBit64(35)
#define wrapText_WidgetFlag iBit64(36)
#define borderTop_WidgetFlag iBit64(37)
#define overflowScrollable_WidgetFlag iBit64(38)
#define focusRoot_WidgetFlag iBit64(39)
#define unhittable_WidgetFlag iBit64(40)
#define touchDrag_WidgetFlag iBit64(41) /* touch event behavior: immediate drag */
#define noBackground_WidgetFlag iBit64(42)
#define drawBackgroundToHorizontalSafeArea_WidgetFlag iBit64(43)
#define drawBackgroundToVerticalSafeArea_WidgetFlag iBit64(44)
#define visualOffset_WidgetFlag iBit64(45)
#define parentCannotResize_WidgetFlag iBit64(46)
#define noTopFrame_WidgetFlag iBit64(47)
#define unpadded_WidgetFlag iBit64(48) /* ignore parent's padding */
#define extraPadding_WidgetFlag iBit64(49)
#define borderBottom_WidgetFlag iBit64(50)
#define horizontalOffset_WidgetFlag iBit64(51) /* default is vertical offset */
#define chevron_WidgetFlag iBit64(52)
#define drawBackgroundToBottom_WidgetFlag iBit64(53)
#define dragged_WidgetFlag iBit64(54)
#define hittable_WidgetFlag iBit64(55)
#define safePadding_WidgetFlag iBit64(56) /* padded using safe area insets */
#define moveToParentBottomEdge_WidgetFlag iBit64(57)
#define parentCannotResizeHeight_WidgetFlag iBit64(58)
#define ignoreForParentWidth_WidgetFlag iBit64(59)
#define noFadeBackground_WidgetFlag iBit64(60)
#define destroyPending_WidgetFlag iBit64(61) /* TODO: needed? */
#define leftEdgeDraggable_WidgetFlag iBit64(62)
#define refChildrenOffset_WidgetFlag iBit64(63) /* visual offset determined by the offset of referenced children */
enum iWidgetAddPos {
back_WidgetAddPos,
front_WidgetAddPos,
};
enum iWidgetFocusDir {
forward_WidgetFocusDir,
backward_WidgetFocusDir,
};
struct Impl_Widget {
iObject object;
iString id;
int64_t flags;
iRect rect;
iInt2 minSize;
iWidget * sizeRef;
iWidget * offsetRef;
const iAnim *animOffsetRef;
int padding[4]; /* left, top, right, bottom */
iAnim visualOffset;
int bgColor;
int frameColor;
iObjectList *children;
iWidget * parent;
iBool (*commandHandler)(iWidget *, const char *);
iRoot * root;
};
iDeclareObjectConstruction(Widget)
iLocalDef iWidget *as_Widget(iAnyObject *d) {
#if !defined (NDEBUG)
if (d) {
iAssertIsObject(d);
iAssert(isInstance_Object(d, &Class_Widget));
}
#endif
return (iWidget *) d;
}
iLocalDef const iWidget *constAs_Widget(const iAnyObject *d) {
#if !defined (NDEBUG)
if (d) {
iAssertIsObject(d);
iAssert(isInstance_Object(d, &Class_Widget));
}
#endif
return (const iWidget *) d;
}
void destroy_Widget (iWidget *); /* widget removed and deleted later */
void destroyPending_Widget (void);
void releaseChildren_Widget (iWidget *);
/* Coordinate spaces:
- window: 0,0 is at the top left corner of the window
- local: 0,0 is at the top left corner of the parent widget
- inner: 0,0 is at the top left corner of the widget */
iWidget * root_Widget (const iWidget *);
const iString * id_Widget (const iWidget *);
int64_t flags_Widget (const iWidget *);
iRect bounds_Widget (const iWidget *); /* outer bounds */
iRect innerBounds_Widget (const iWidget *);
iRect boundsWithoutVisualOffset_Widget(const iWidget *);
iInt2 localToWindow_Widget (const iWidget *, iInt2 localCoord);
iInt2 windowToLocal_Widget (const iWidget *, iInt2 windowCoord);
iInt2 innerToWindow_Widget (const iWidget *, iInt2 innerCoord);
iInt2 windowToInner_Widget (const iWidget *, iInt2 windowCoord);
iBool contains_Widget (const iWidget *, iInt2 windowCoord);
iBool containsExpanded_Widget (const iWidget *, iInt2 windowCoord, int expand);
iAny * hitChild_Widget (const iWidget *, iInt2 windowCoord);
iAny * findChild_Widget (const iWidget *, const char *id);
const iPtrArray *findChildren_Widget (const iWidget *, const char *id);
iAny * findParentClass_Widget (const iWidget *, const iAnyClass *class);
iAny * findFocusable_Widget (const iWidget *startFrom, enum iWidgetFocusDir focusDir);
iAny * findOverflowScrollable_Widget (iWidget *);
size_t childCount_Widget (const iWidget *);
void draw_Widget (const iWidget *);
void drawBackground_Widget (const iWidget *);
void drawChildren_Widget (const iWidget *);
iLocalDef int width_Widget(const iAnyObject *d) {
if (d) {
iAssert(isInstance_Object(d, &Class_Widget));
return ((const iWidget *) d)->rect.size.x;
}
return 0;
}
iLocalDef int height_Widget(const iAnyObject *d) {
if (d) {
iAssert(isInstance_Object(d, &Class_Widget));
return ((const iWidget *) d)->rect.size.y;
}
return 0;
}
iLocalDef iObjectList *children_Widget(iAnyObject *d) {
if (d == NULL) return NULL;
iAssert(isInstance_Object(d, &Class_Widget));
return ((iWidget *) d)->children;
}
iLocalDef iWidget *parent_Widget(const iAnyObject *d) {
if (d) {
iAssert(isInstance_Object(d, &Class_Widget));
return ((iWidget *) d)->parent;
}
return NULL;
}
iLocalDef iWidget *lastChild_Widget(iAnyObject *d) {
return (iWidget *) back_ObjectList(children_Widget(d));
}
iBool isVisible_Widget (const iAnyObject *);
iBool isDisabled_Widget (const iAnyObject *);
iBool isFocused_Widget (const iAnyObject *);
iBool isHover_Widget (const iAnyObject *);
iBool isSelected_Widget (const iAnyObject *);
iBool isUnderKeyRoot_Widget (const iAnyObject *);
iBool isCommand_Widget (const iWidget *d, const SDL_Event *ev, const char *cmd);
iBool hasParent_Widget (const iWidget *d, const iWidget *someParent);
iBool isAffectedByVisualOffset_Widget
(const iWidget *);
iBool isBeingVisuallyOffsetByReference_Widget
(const iWidget *);
void setId_Widget (iWidget *, const char *id);
void setFlags_Widget (iWidget *, int64_t flags, iBool set);
void setPos_Widget (iWidget *, iInt2 pos);
void setFixedSize_Widget (iWidget *, iInt2 fixedSize);
void setMinSize_Widget (iWidget *, iInt2 minSize);
void setPadding_Widget (iWidget *, int left, int top, int right, int bottom);
iLocalDef void setPadding1_Widget (iWidget *d, int padding) { setPadding_Widget(d, padding, padding, padding, padding); }
void setVisualOffset_Widget (iWidget *, int value, uint32_t span, int animFlags);
void showCollapsed_Widget (iWidget *, iBool show); /* takes care of rearranging, refresh */
void setBackgroundColor_Widget (iWidget *, int bgColor);
void setFrameColor_Widget (iWidget *, int frameColor);
void setCommandHandler_Widget (iWidget *, iBool (*handler)(iWidget *, const char *));
void setRoot_Widget (iWidget *, iRoot *root); /* updates the entire tree */
iAny * addChild_Widget (iWidget *, iAnyObject *child); /* holds a ref */
iAny * addChildPos_Widget (iWidget *, iAnyObject *child, enum iWidgetAddPos addPos);
iAny * addChildPosFlags_Widget (iWidget *, iAnyObject *child, enum iWidgetAddPos addPos, int64_t childFlags);
iAny * addChildFlags_Widget (iWidget *, iAnyObject *child, int64_t childFlags); /* holds a ref */
iAny * insertChildAfter_Widget (iWidget *, iAnyObject *child, size_t afterIndex);
iAny * insertChildAfterFlags_Widget(iWidget *, iAnyObject *child, size_t afterIndex, int64_t childFlags);
iAny * removeChild_Widget (iWidget *, iAnyObject *child); /* returns a ref */
iAny * child_Widget (iWidget *, size_t index); /* O(n) */
size_t childIndex_Widget (const iWidget *, const iAnyObject *child); /* O(n) */
void arrange_Widget (iWidget *);
void resetSize_Widget (iWidget *);
iBool scrollOverflow_Widget (iWidget *, int delta); /* moves the widget */
iBool dispatchEvent_Widget (iWidget *, const SDL_Event *);
iBool processEvent_Widget (iWidget *, const SDL_Event *);
void postCommand_Widget (const iAnyObject *, const char *cmd, ...);
void refresh_Widget (const iAnyObject *);
iBool equalWidget_Command (const char *cmd, const iWidget *widget, const char *checkCommand);
void setFocus_Widget (iWidget *);
iWidget * focus_Widget (void);
void setHover_Widget (iWidget *);
iWidget * hover_Widget (void);
void unhover_Widget (void);
void setMouseGrab_Widget (iWidget *);
iWidget * mouseGrab_Widget (void);
void raise_Widget (iWidget *);
iBool hasVisibleChildOnTop_Widget
(const iWidget *parent);
void printTree_Widget (const iWidget *);
void identify_Widget (const iWidget *); /* prints to stdout */
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